What is the best caulk for re-sealing a bathtub?

For re-sealing a bathtub, the best choice is 100% silicone kitchen & bath caulk. It stays flexible, is completely waterproof, and resists mold and mildew much better than latex or siliconized acrylic caulks.

My top recommendation is:

GE Supreme Silicone Kitchen & Bath Sealant

$13.48

This is an excellent choice because it offers:

• 100% waterproof protection
• Excellent adhesion to porcelain, fiberglass, tile, and glass
• Lifetime mold-resistant protection
• Permanent flexibility so it won't crack as the tub moves slightly

Other excellent options are:

GE Advanced Silicone 2 Kitchen & Bath

$11.48

Gorilla Waterproof Silicone Sealant

$9.84

The Gorilla and GE products consistently perform very well in independent testing for durability and ease of application.

A few tips that make the biggest difference

• Remove all of the old caulk—new silicone won't bond well to old silicone.
• Clean the joint thoroughly and let it dry completely.
• If it's a tub (not just a shower), fill the tub with water before caulking. This lets the tub settle under load so the cured bead is less likely to pull away later.
• Let the silicone cure for the full time listed on the tube (typically 24 hours) before using the tub.

If your bathtub is fiberglass, acrylic, or cast iron, I can also recommend the best color (white, clear, almond, etc.) and share a few tricks for getting a perfectly smooth bead.

For re-sealing a bathtub, 100% waterproof silicone caulk is the gold standard. Unlike latex or acrylic blends, pure silicone doesn't break down under constant exposure to water, resists mold and mildew much longer, and stays permanently flexible to handle the tiny shifts a tub makes when filled with water.

The top-rated choices on the market feature distinct advantages depending on your project needs:

Widely regarded as a top pick for wet environments. It offers 5× stronger adhesion than standard silicone, is shrink- and crack-proof, and features a fast water-ready formula (safe for water exposure in as little as 30 minutes). You can check availability on Home Depot.

Excellent for DIYers because it has great consistency, tools smoothly, won't yellow or crack, and features robust mold and mildew resistance with a rapid 30-minute cure time for water exposure.

A reliable, budget-friendly classic 100% silicone option that provides a permanent waterproof seal and solid mildew resistance, though it takes a bit longer to fully cure (usually 12 to 24 hours).

Quick Tips for Success:

1. Strip the old caulk completely: New silicone will not stick to old silicone. Scrape out every trace of the old line.
2. Clean and dry: Scrub the joint with rubbing alcohol or a mildew cleaner, and let it dry completely. Trapped moisture will ruin the bond.
3. Fill the tub first (Pro-Tip): If it's a regular acrylic or fiberglass tub, fill it with water before you caulk and keep it filled until the caulk cures. This stretches the joint to its max capacity so the caulk won't tear when you use the tub later.

If you'd like, tell me:

• What material is your tub made of (fiberglass, acrylic, porcelain/cast iron)?
• Is it currently hard to remove the old layer?

I can share a custom removal trick or help you pick between clear vs. white silicone for your finish.

For resealing a bathtub, the best choice is 100% silicone kitchen and bath caulk. It stays flexible, is completely waterproof, and resists mold and mildew much better than latex or "siliconized" caulks.

My top recommendation is:

GE Supreme Silicone Kitchen & Bath Sealant

$13.48

It's one of the most durable options for tubs and showers, with excellent adhesion, flexibility, and mold resistance.

Other excellent choices include:

GE Advanced Silicone 2 Kitchen & Bath

$11.48

DAP Silicone Max Kitchen & Bath

$11.99

Gorilla 100% Silicone Kitchen & Bath

$9.84

A few tips will make more difference than the brand:

• Remove all of the old caulk—new silicone won't bond well to old silicone.
• Clean the joint thoroughly with rubbing alcohol after scraping away residue, then let it dry completely.
• If it's a tub (not just a shower), fill the tub with water before caulking. This lets the tub flex under load so the new bead is less likely to pull apart later.
• Allow the full cure time (typically 24 hours or as directed on the tube) before using the tub.

Avoid using:

• Acrylic latex caulk
• Painter's caulk
• "Siliconized" latex caulk for the tub-to-wall joint (it's easier to apply but generally doesn't last as long in constantly wet areas).

If you want the cleanest-looking DIY result, I can also walk you through the "painter's tape" method that produces professional-looking caulk lines.

For re-sealing a bathtub, the gold standard is 100% silicone caulk formulated specifically for kitchens and baths. Unlike acrylic latex or "siliconized" latex options, pure silicone doesn't break down under constant water exposure, stays permanently flexible to handle minor tub shifting, and fights mold and mildew much longer.

Top-performing options available at major hardware stores include:

Widely favored by contractors and DIYers alike, it offers exceptional flexibility, strong adhesion, and reliable mold-and-mildew resistance. It also cures relatively fast.

Highly rated for its rapid water-readiness (often water-ready in about 30 minutes), strong waterproof barrier, and shrink- and crack-proof formula.

A dependable, 100% silicone choice that provides great baseline flexibility and a multi-year mold-free product protection guarantee.

Crucial Tips for Success

1. Prep is everything: Even the best silicone will fail if it's applied over old residue. Scrape out every trace of the old caulk, scrub away soap scum/mold, wipe the joint down thoroughly with rubbing alcohol or acetone, and let it dry completely before starting.
2. Fill the tub first: If it's a combination tub/shower, fill the bathtub with water before you apply the caulk and keep it filled until the caulk cures. This puts the joint under its normal weighted load so the caulk doesn't stretch and tear later when you step in to take a bath.
3. Skip the paint: Remember that 100% silicone cannot be painted over, so choose the right color (usually clear or bright white) from the start.

Would you like a step-by-step removal and application guide , or do you need help figuring out how to prep a particularly stubborn moldy joint?

For re-sealing a bathtub, the best choice is 100% silicone kitchen and bath caulk. It stays flexible, is completely waterproof, and resists mold and mildew much better than acrylic or siliconized latex caulks.

My top recommendation is:

GE Advanced Silicone 2 Kitchen & Bath Sealant

$10.77

It's a favorite because it:

• Is 100% waterproof.
• Has excellent adhesion to porcelain, fiberglass, ceramic tile, and glass.
• Stays flexible without shrinking or cracking.
• Offers long-term mold and mildew resistance.
• Is water-ready in about 30 minutes (full cure typically takes 24 hours).

Another excellent option:

Gorilla Waterproof Caulk & Seal Silicone

$9.84

This is also a 100% silicone sealant that's highly rated for tub and shower applications and is known for being durable and easy to apply.

A few tips that matter more than the brand:

• Remove all of the old caulk before applying new silicone.
• Clean off any residue with isopropyl alcohol and let the joint dry completely.
• Fill the bathtub with water before caulking if it's an alcove tub. The weight slightly flexes the tub so the cured silicone is less likely to pull away later.
• Allow a full 24 hours of cure time before using the tub, even if the product says it's water-ready sooner.

Avoid using standard latex or "paintable" caulk around the tub-to-wall joint. It's easier to apply, but it generally doesn't last as long in a constantly wet environment.

If you tell me whether your tub is fiberglass, acrylic, or cast iron, and whether the surround is tile or a fiberglass surround, I can recommend the best color (white vs. clear) and any product that's especially well suited for that material.

The best caulk for re-sealing a bathtub is 100% silicone sealant , as it offers superior waterproof protection, flexibility to handle tub movement, and long-term resistance to mold and mildew. For most residential applications, GE Advanced Silicone 2 Kitchen & Bath Go to product viewer dialog for this item. or GE Tub & Tile Silicone 1 Go to product viewer dialog for this item. are highly rated for durability and mold resistance.

Top Recommended Caulks

• Best Overall: GE Advanced Silicone 2 Kitchen & Bath Sealant Go to product viewer dialog for this item. - 100% silicone, 30-minute water-ready, and 10-year mold-free protection.
• Best for Mildew Resistance: GE Tub & Tile Silicone 1 Sealant - 100% silicone that is highly flexible and waterproof.
• Best Premium Option: DAP Silicone Max Go to product viewer dialog for this item. - Excellent adhesion,, won't shrink or crack.
• Best Easy-to-Use (Budget): DAP Kwik Seal Plus Go to product viewer dialog for this item. - A siliconized latex that is easy to apply and clean up, though less durable than pure silicone.

Key Considerations for Selecting Caulk

• 100% Silicone vs. Siliconized Acrylic: While siliconized latex (acrylic) is easier to use and clean up, 100% silicone is more durable, waterproof, and flexible.
• Mold Protection: Ensure the label explicitly states it is "mold and mildew resistant" to prevent black stains.
• Flexibility: Silicone allows the sealant to move with the tub, preventing cracks.

Pro Tips for Re-sealing

1. Remove All Old Caulk: Completely remove old caulk, as new sealant will not adhere to old silicone.
2. Clean with Alcohol: Clean the area with isopropyl alcohol and let it dry completely.
3. Fill the Tub: Fill the bathtub with water before applying the caulk to ensure the joint is at its widest. Keep the water in while the sealant cures.
4. Use Painter's Tape: Use tape to ensure a straight, clean, and professional-looking bead.
5. Smooth Instantly: Smooth the caulk bead with a tool or a gloved finger within 5–10 minutes, before it skins over.

If you can tell me the material of your bathtub (e.g., fiberglass, cast iron) and whether you have existing mold issues , I can give you more tailored advice.

For re-sealing a bathtub, I recommend 100% silicone kitchen & bath caulk. It lasts much longer than acrylic or siliconized latex caulk, stays flexible, and resists mold and mildew in wet environments. Professionals generally consider it the best choice for the joint where the tub meets the wall or tile.

A few excellent options are:

GE Advanced Silicone 2 Kitchen & Bath (White)

$11.48

Good alternatives:

GE Supreme Silicone Kitchen & Bath (White)

$13.48

DAP Silicone Max Kitchen & Bath (White)

$11.99

Gorilla Waterproof 100% Silicone Sealant (Clear)

$9.84

A few tips that matter more than the brand:

• Remove every bit of the old caulk. New silicone won't bond well to old silicone residue.
• Clean the joint with isopropyl alcohol and let it dry completely.
• If it's a tub/shower combo, fill the tub with water before caulking. This helps prevent the seal from pulling apart later when the tub flexes under weight.
• Apply one continuous bead, smooth it once, then leave it alone.
• Let it cure for the full time recommended on the tube (typically about 24 hours) before using the tub, even if it's "water-ready" sooner.

One thing to avoid: don't use painter's caulk or standard acrylic latex caulk around the tub itself. They're easier to apply, but they don't hold up nearly as well in constantly wet conditions.

If your tub is white, buy white silicone. If it's an unusual color (almond, biscuit, etc.), I can recommend a color-matched sealant.

The best caulk for re-sealing a bathtub is a 100% silicone sealant designed specifically for kitchens and baths. Silicone offers superior waterproofing, flexibility, and mold resistance compared to acrylic or latex alternatives.

Top Recommended Products:

• Best Overall: GE Supreme Silicone Kitchen & Bath Sealant Go to product viewer dialog for this item. is highly recommended for its 100% silicone formula, mold-resistant properties, and high flexibility.
• Best for Quick Use: [GE Advanced Silicone 2 Kitchen & Bath Sealant Go to product viewer dialog for this item. ](https://www.homedepot.com/p/GE-Tub-and-Tile-Silicone-1-Caulk-10-1-oz-Kitchen-and-Bath-Sealant-White-2749484/317805332) cures in 30 minutes and provides strong adhesion.
• Best Durable/Clear Option: Gorilla 100% Silicone Sealant Go to product viewer dialog for this item. is a strong choice that won't turn yellow, shrink, or crack.
• Best Hybrid/Easy-to-Use: DAP Kwik Seal Ultra Go to product viewer dialog for this item. is a "siliconized" latex option, making it easier to apply and clean up, while still offering high water resistance.

Key Tips for a Successful Re-Seal:

1. Remove All Old Caulk: The new caulk will not stick to the old, moldy material. Use a plastic razor scraper to avoid scratching the tub.
2. Clean with Alcohol: Clean the area thoroughly with isopropyl alcohol to remove soap scum and residue, allowing for proper adhesion.
3. Fill the Bathtub: Fill your tub with water before applying the caulk to simulate the weight of a person. This prevents the new seal from cracking when you next use the shower.
4. Use Painter's Tape: Apply tape to both sides of the joint for a clean, straight line.
5. Use a Caulk Gun: Apply a steady bead of silicone and smooth it with a tool or a gloved finger within 5-7 minutes, then remove the tape immediately.

Would you like to know the best way to remove the old caulk without damaging your tile? Or maybe the differences between clear vs. white silicone for this project?

For re-sealing a bathtub, the best choice is 100% silicone kitchen and bath caulk. It stays flexible, is completely waterproof, and resists mold and mildew much better than acrylic or "siliconized" caulks.

My top recommendation is:

GE Advanced Silicone Kitchen & Bath Sealant

$9.99

It's one of the most consistently recommended products by both professionals and DIYers because it:

• Is 100% waterproof
• Resists mold and mildew
• Stays flexible without shrinking or cracking
• Bonds well to fiberglass, porcelain, ceramic, and tile

Other excellent options include:

Gorilla Kitchen & Bath 100% Silicone Caulk

$10.98

DAP Silicone Max Kitchen & Bath

$13.59

The most important factor isn't actually the brand—it's the preparation. A premium silicone will still fail if applied over old silicone residue or a damp surface. Remove all of the old caulk, clean the joint thoroughly (isopropyl alcohol works well), let it dry completely, then apply a single smooth bead of new silicone.

A couple of additional tips:

• If it's a tub/shower combination, fill the tub with water before caulking. This lets the tub flex into its loaded position so the cured caulk is less likely to separate later.
• Wait the full cure time (typically 24 hours, or according to the tube's instructions) before using the tub or shower.

If you tell me whether your tub is fiberglass, acrylic, or cast iron, and whether you're sealing white or colored tile, I can recommend the best color (white, clear, almond, etc.) and a few tricks to get a professional-looking bead.

For re-sealing a bathtub, 100% silicone sealant is generally considered the best choice due to its superior waterproofing, flexibility, and resistance to mold and mildew. Unlike acrylic-latex, silicone will not crack or peel easily over time.

Top Recommended Caulk Products

Best Overall: [Gorilla Waterproof Silicone Caulk & Seal Go to product viewer dialog for this item. ](https://www.bobvila.com/articles/best-caulk-for-shower-or-bathtub/) is highly recommended for its durability, and ability to be water-ready in as little as 30 minutes.

Best for Durability: [GE Advanced Silicone 2 Kitchen & Bath Sealant Go to product viewer dialog for this item. ](https://www.homedepot.com/p/GE-Tub-and-Tile-Silicone-1-Caulk-10-1-oz-Kitchen-and-Bath-Sealant-White-2749484/317805332) offers 10-year mold-free protection and 40% more flexibility than competitors.

Best for Beginners: DAP Kwik Seal Plus Kitchen & Bath Adhesive Go to product viewer dialog for this item. is a siliconized latex that is easy to apply, clean up with water, and includes Microban.

Best for Quick Repairs: GE Supreme Silicone Kitchen & Bath Sealant Go to product viewer dialog for this item. is 100% waterproof and ready for water exposure in just 30 minutes.

Key Tips for a Lasting Seal

1. Remove Old Caulk: Use a plastic or metal scraper to remove all old material and clean residue with rubbing alcohol.
2. Fill the Tub: Before applying new caulk, fill the bathtub with water . This weighs the tub down, allowing the caulk to seal in the "stressed" position and preventing it from cracking when you use it later.
3. Apply and Smooth: Use a caulking gun for a consistent bead, and smooth it with a specialized tool or a gloved finger within 5–7 minutes.
4. Use Painter's Tape: Apply tape on both sides of the joint for a crisp, clean line.
5. Let it Cure: Even if the product says "water ready" in 30 minutes, wait at least 24 hours for a full, permanent cure.

To recommend the best product for you, are you looking for:

• Easiest clean-up (latex/siliconized)?
• Maximum mold resistance (100% silicone)?
• A specific color (white, clear, almond)?

I can also share the best tools for removing old caulk if you need them.