Looking for the best waterproof fillers to fix leaks, cracks, and holes? We’ve tested and listed the top 10 waterproof fillers to help you choose the perfect product for your home, auto, or outdoor projects with confidence.
Waterproof fillers are a must-have for fixing leaks, cracks, and holes. They work on wood, concrete, metal, and more. These products save time and money on repairs.
Flex Seal Power Putty and Gorilla Wood Filler are top choices for quick fixes. They are easy to use and last long. You can trust them for home, auto, or outdoor projects.
We tested these fillers to find the best ones for you. Our guide will help you pick the perfect product for your needs. Get ready to fix anything with confidence!
List of Top 10 Waterproof Fillers
| Image | Title | Best For | Price |
|---|---|---|---|
 |
Flex Paste Rubberized Waterproof Sealant Paste, Clear, Half-Quart |
Flex Paste is perfect for homeowners, DIY fans, and fix-it helpers. It seals water leaks, cracks, and holes fast. You can use it underwater and it stays strong and flexible. It is clear, paintable, and keeps things dry. Great for tubs, pools, roofs, and gutters. No rush—just smooth seal and lasting protection. |
|
 |
Gorilla All Purpose Wood Filler, Natural Finish, 16 oz Tub, 1-Pack |
Perfect for DIY lovers and handy homeowners, this Gorilla Wood Filler fixes cracks, holes, and gouges with a strong, water-resistant finish. Use it inside or outside for smooth, natural results that you can paint, stain, or sand. |
|
 |
Flex Seal Power Putty, Moldable Waterproof Rubberized Sealant, Instantly Fills Gaps, Cracks, or Holes, Removable Reusable, Works Underwater, Pipes, Marine, Auto, RV, Metal, Plastic, Wood, White 16 oz |
Flex Seal Power Putty is perfect for anyone who needs a quick, easy fix for leaks, cracks, or holes. It’s great for DIYers, homeowners, and outdoor enthusiasts who want a reliable, reusable solution that works anywhere, even underwater. |
|
 |
6-Pack New Type White Waterproof Sealant Mastic, Repair Sealing Clay, Quick Mending Mud for Drain Connection, Wall Hole, Air Conditioning Hole Waterproof Seal Putty |
This 6-pack waterproof sealant is perfect for anyone who needs a quick, easy fix for holes, leaks, or repairs. Whether you’re fixing a wall, sealing a drain, or blocking odors, this soft, flexible clay is simple to use and works great. |
|
 |
Flex Seal Power Putty, Moldable Waterproof Rubberized Sealant, Instantly Fills Gaps, Cracks, or Holes, Removable Reusable, Works Underwater, Pipes, Marine, Auto, RV, Metal, Plastic, Wood, Gray 16 oz |
Flex Seal Power Putty is perfect for anyone who needs a quick, easy fix for leaks, cracks, or holes. It’s great for DIYers, homeowners, and outdoor enthusiasts who want a reliable, reusable solution that works anywhere, even underwater. |
|
 |
PC Products PC-Woody Wood Repair Epoxy Paste, Two-Part 12 oz in Two Cans, Tan |
This wood repair epoxy paste is perfect for anyone who needs to fix damaged or rotted wood. Whether you’re working on indoor or outdoor projects, this two-part epoxy is easy to use and resistant to rot, UV light, and water. |
|
 |
Flex Seal Power Putty, Moldable Waterproof Rubberized Sealant, Instantly Fills Gaps, Cracks, or Holes, Removable Reusable, Works Underwater, Pipes, Marine, Auto, RV, Metal, Plastic, Wood, White 8 oz |
Flex Seal Power Putty is perfect for anyone who needs a quick, easy fix for leaks, cracks, or holes. It’s great for DIYers, homeowners, and outdoor enthusiasts who want a reliable, reusable solution that works anywhere, even underwater. |
|
 |
1PCS Waterproof Concrete Crack Filler & Sealant,Quick Drying Cement Crack Filler Waterproof Repair Sealant for Driveways, Walkways, Patios, Outdoor Concrete Joint Repair |
This waterproof crack filler is perfect for homeowners who want to quickly fix cracks in driveways, walkways, and patios. It’s easy to use and works on many surfaces, making it ideal for anyone needing a reliable, long-lasting solution. |
|
 |
Concrete Crack Filler, 2.65LB High Elasticity Cement Crack Repair Sealant |
This Concrete Crack Filler is perfect for anyone who wants to fix cracks in driveways, sidewalks, or patios. It’s easy to use and works fast, making it great for all types of surfaces. |
|
 |
DAP Textured Mortar Premium Elastomeric Latex Filler & Sealant, Beige, 10.1 Oz (7079810081) |
This DAP Textured Mortar is perfect for homeowners and DIY enthusiasts who want to repair cracks and holes in concrete and masonry surfaces. It’s easy to use and matches most tan surfaces, making it ideal for quick fixes. |
Detailed Reviews
Finding the right waterproof filler can feel overwhelming, but this list of the top 10 options removes the guesswork. Each product is tested and ranked based on real expert reviews and honest customer feedback, so you get only the best picks for quality and value. Whether you need something budget-friendly or built for heavy-duty use, there’s a perfect match here for every repair job—keep reading to discover what makes each one a standout.
1. Flex Paste Rubberized Waterproof Sealant Paste, Clear, Half-Quart
Flex Paste is a rubberized waterproof sealant that coats, seals, and protects surfaces. It works underwater and fills large gaps, making it a versatile solution for various projects.
It comes in a stay-fresh container, dries to a strong, flexible barrier, and is fully paintable once cured. This UV-resistant paste prevents rust and corrosion, offering long-lasting protection.
| Pros | Cons |
|---|---|
|
|
Perfect For:
Flex Paste is perfect for homeowners, DIY fans, and fix-it helpers. It seals water leaks, cracks, and holes fast. You can use it underwater and it stays strong and flexible. It is clear, paintable, and keeps things dry. Great for tubs, pools, roofs, and gutters. No rush—just smooth seal and lasting protection.
Ready to Purchase?
2. Gorilla All Purpose Wood Filler, Natural Finish, 16 oz Tub, 1-Pack
Gorilla Wood Filler fixes cracks, gouges, and holes in wood. It is water resistant and stays strong for indoor or outdoor repairs.
Natural finish spreads smooth. Paintable, stainable, and sandable. Anchors nails and screws.
| Pros | Cons |
|---|---|
|
|
Perfect For:
Perfect for DIY lovers and handy homeowners, this Gorilla Wood Filler fixes cracks, holes, and gouges with a strong, water-resistant finish. Use it inside or outside for smooth, natural results that you can paint, stain, or sand.
Ready to Purchase?
3. Flex Seal Power Putty, Moldable Waterproof Rubberized Sealant, Instantly Fills Gaps, Cracks, or Holes, Removable Reusable, Works Underwater, Pipes, Marine, Auto, RV, Metal, Plastic, Wood, White 16 oz
Flex Seal Power Putty stops leaks in seconds. It works on metal, wood, and plastic. Just shape it with your hands to fill any gap.
This sealant forms a strong and waterproof barrier. It even works underwater to fix your pipes.
| Pros | Cons |
|---|---|
|
|
Perfect For:
Flex Seal Power Putty is perfect for anyone who needs a quick, easy fix for leaks, cracks, or holes. It’s great for DIYers, homeowners, and outdoor enthusiasts who want a reliable, reusable solution that works anywhere, even underwater.
Ready to Purchase?
4. 6-Pack New Type White Waterproof Sealant Mastic, Repair Sealing Clay, Quick Mending Mud for Drain Connection, Wall Hole, Air Conditioning Hole Waterproof Seal Putty
This 6-pack of white waterproof sealant is a handy repair tool. It’s easy to shape and apply, perfect for fixing holes, leaks, and more.
Soft and flexible, it works great for wall repairs and plumbing fixes. Just mold it in place and let it dry for 2-3 days. It’s a reliable seal for any job.
Each 30g bag is easy to store and use. The 6-pack ensures you have plenty for future repairs. It’s a must-have for household fixes.
| Pros | Cons |
|---|---|
|
|
Perfect For:
This 6-pack waterproof sealant is perfect for anyone who needs a quick, easy fix for holes, leaks, or repairs. Whether you’re fixing a wall, sealing a drain, or blocking odors, this soft, flexible clay is simple to use and works great.
Ready to Purchase?
5. Flex Seal Power Putty, Moldable Waterproof Rubberized Sealant, Instantly Fills Gaps, Cracks, or Holes, Removable Reusable, Works Underwater, Pipes, Marine, Auto, RV, Metal, Plastic, Wood, Gray 16 oz
Flex Seal Power Putty is a moldable sealant that fixes leaks fast. It fills gaps, cracks, and holes instantly. Use it on pipes, cars, boats, and more.
It works underwater and on wet surfaces. No tools or drying time needed. Just shape it by hand and press it in place.
The putty is removable and reusable. It’s 100% waterproof and forms a strong seal. Perfect for home, auto, or marine repairs.
| Pros | Cons |
|---|---|
|
|
Perfect For:
Flex Seal Power Putty is perfect for anyone who needs a quick, easy fix for leaks, cracks, or holes. It’s great for DIYers, homeowners, and outdoor enthusiasts who want a reliable, reusable solution that works anywhere, even underwater.
Ready to Purchase?
6. PC Products PC-Woody Wood Repair Epoxy Paste, Two-Part 12 oz in Two Cans, Tan
PC Products PC-Woody is a two-part epoxy paste that fixes rotted or missing wood. It’s resistant to dry rot, UV light, and water, making it durable. Use it indoors or outdoors for reliable repairs.
It works in temperatures from 35°F to 115°F. The high tack formula stops drips and sags. Always mix part A and part B equally on a flat surface.
This tan-colored paste blends well with wood. It’s perfect for fresh or saltwater environments. Trust it to restore and strengthen wood easily.
| Pros | Cons |
|---|---|
|
|
Perfect For:
This wood repair epoxy paste is perfect for anyone who needs to fix damaged or rotted wood. Whether you’re working on indoor or outdoor projects, this two-part epoxy is easy to use and resistant to rot, UV light, and water.
Ready to Purchase?
7. Flex Seal Power Putty, Moldable Waterproof Rubberized Sealant, Instantly Fills Gaps, Cracks, or Holes, Removable Reusable, Works Underwater, Pipes, Marine, Auto, RV, Metal, Plastic, Wood, White 8 oz
Flex Seal Power Putty stops leaks in seconds. You mold it by hand with no tools. It fills every gap, crack, and hole.
This putty works wet or underwater. It forms a strong, waterproof seal. You can remove and reuse it fast.
Fix your pipes, boats, and cars today. Grab your pack now to save time.
| Pros | Cons |
|---|---|
|
|
Perfect For:
Flex Seal Power Putty is perfect for anyone who needs a quick, easy fix for leaks, cracks, or holes. It’s great for DIYers, homeowners, and outdoor enthusiasts who want a reliable, reusable solution that works anywhere, even underwater.
Ready to Purchase?
8. 1PCS Waterproof Concrete Crack Filler & Sealant,Quick Drying Cement Crack Filler Waterproof Repair Sealant for Driveways, Walkways, Patios, Outdoor Concrete Joint Repair
Fix cracks fast with this waterproof concrete filler. It’s easy to apply and works great on driveways, patios, and walkways.
Quick drying, long-lasting, and versatile. Use it indoors or out for reliable repairs.
| Pros | Cons |
|---|---|
|
|
Perfect For:
This waterproof crack filler is perfect for homeowners who want to quickly fix cracks in driveways, walkways, and patios. It’s easy to use and works on many surfaces, making it ideal for anyone needing a reliable, long-lasting solution.
Ready to Purchase?
9. Concrete Crack Filler, 2.65LB High Elasticity Cement Crack Repair Sealant
Fix cracks fast with this strong concrete repair sealant. It stretches with heat and cold so it will not break.
Water cannot get in through the tough seal. It works great on driveways, roofs, and patios.
You just pour it in to fill any gap. The surface dries fast and stays smooth. Enjoy clean and safe floors today.
| Pros | Cons |
|---|---|
|
|
Perfect For:
This Concrete Crack Filler is perfect for anyone who wants to fix cracks in driveways, sidewalks, or patios. It’s easy to use and works fast, making it great for all types of surfaces.
Ready to Purchase?
10. DAP Textured Mortar Premium Elastomeric Latex Filler & Sealant, Beige, 10.1 Oz (7079810081)
DAP Textured Mortar fixes cracks and holes in concrete and masonry surfaces. The premium elastomeric latex formula sticks well and stays flexible. It works on mortar, concrete, brick, stucco, and more.
This waterproof sealant is ready for rain in 24 hours. You can paint it after just 2 hours for a custom look. The beige texture blends with most tan surfaces and won’t crack.
It lasts long and keeps surfaces sealed tight. Exceeds ASTM C920 and C835 standards for quality and strength.
| Pros | Cons |
|---|---|
|
|
Perfect For:
This DAP Textured Mortar is perfect for homeowners and DIY enthusiasts who want to repair cracks and holes in concrete and masonry surfaces. It’s easy to use and matches most tan surfaces, making it ideal for quick fixes.
Ready to Purchase?
Buying Guide
Waterproof fillers are essential for fixing leaks, cracks, and holes. They save time and money on repairs.
Choosing the right waterproof filler can make your projects easier. Here’s a guide to help you pick the best one for your needs.
-
Surface Type:
Check where you’ll use the filler. Some work on wood, concrete, metal, or plastic. Pick one that matches your surface. -
Water Resistance:
Look for 100% waterproof options. These are best for wet areas like pipes, roofs, or outdoor repairs. -
Ease of Use:
Choose fillers that are easy to shape and apply. Moldable putties or quick-drying options save time. -
Drying Time:
Some fillers dry in hours, while others take days. Pick one that fits your project timeline. -
Paintability:
If you want to paint over the filler, ensure it’s paintable. This helps it blend with your surface. -
Flexibility:
Flexible fillers are great for surfaces that expand or contract. They prevent cracks from reappearing. -
UV Resistance:
For outdoor projects, choose fillers that are UV-resistant. This stops them from breaking down in sunlight. -
Quantity:
Buy the right amount for your project. Some come in small packs, while others offer bulk options. -
Reusability:
Some fillers are removable and reusable. This is handy for temporary fixes or future repairs.
With these tips, you’ll find the perfect waterproof filler for any job. Fix anything with confidence!