DRYLOK Extreme Masonry Waterproofer Review (2026)
By The DIYPicks Team · Updated July 2026
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- Interior basement walls
- Foundation and block walls
- Below grade masonry
- Stopping water seepage under pressure
The go-to interior film-forming waterproofer for basement and foundation walls, rated to hold back water at up to 15 psi with a 15-year warranty. Best for bare masonry block or poured walls where you need a true waterproof barrier, not just a repellent.
Pros
- Encapsulated polymers bridge pores and stop water under up to 15 psi of hydrostatic pressure
- Backed by a 15-year waterproofing warranty when applied at two full coats
- Water-based cleanup and can be tinted, unlike bare penetrating sealers
Cons
- Requires bare, unpainted, unsealed masonry, so old paint or prior sealer must be removed first
- Two thick coats at 75-100 sq ft per gallon means it covers far less area than penetrating sealers
- As a surface film it can blister or peel if applied over a previously coated or dirty wall
Specifications
| type | Film-forming masonry waterproofer (latex) |
|---|---|
| finish | White paint-like film (tintable) |
| coverage | 75-100 sq ft per gallon per coat |
| coats | 2 coats required for warranty |
| hydrostaticRating | Stops water up to 15 psi |
| warranty | 15 years when applied per directions |
| cleanup | Soap and water |