Concrete sealers and crack repair: Loctite PL S20 self-leveling concrete crack sealant

Concrete & Masonry Solutions: Crack Repair, Waterproofing & Sealers

What are you trying to fix? Start with the problem. Each collection below holds the products for one job, and its page walks through the prep steps the makers call for.

See the full guide below the products

23 Products

About Concrete & Masonry Solutions: Crack Repair, Waterproofing & Sealers

  • Concrete Crack & Joint Repair: cracks and joints in driveways, garage floors, sidewalks, walls, foundations and mortar. Prep: clean out oil and loose material, then add backer rod to joints deeper than 1/2 in.
  • Masonry & Block Waterproofers: water soaking into or through block, brick, stucco and basement walls. Prep: let new masonry cure, clean, remove mildew and efflorescence, and patch cracks first.
  • Clear Concrete Sealers: protecting patios, walkways and basement slabs from water and stains. Not for garage floors. Prep: degrease, check for old sealer, run a moisture test, and give new concrete 28 days to cure.
  • Self-Leveling Concrete Sealant: the pourable sealants for flat floor and driveway joints, on one page.

Other concrete jobs in this collection

  • Priming bare concrete for porch and floor paint: Valspar Concrete Bonding Primer. Valspar says to clean, degrease and etch first.
  • Setting bolts, threaded rod and rebar: Sika AnchorFix-1, for uncracked concrete and solid masonry.

Shop related: caulk and sealants, primers and sealers, prep, patch, prime and seal, Okon, Seal-Krete, Loctite, Sika, and the concrete prep checklist.

FAQ

What is the best sealer for a garage floor?

None of the clear sealers here is made for garage floors. Rust-Oleum says Okon Seal & Finish is not recommended for driveways or garages and that chemicals in some car tires may cause the coating to lift. For a garage slab, seal the cracks and joints with Loctite PL S20, DAP AMP Self-Leveling or Sika Self-Leveling Sealant, which their makers list for garages.

How do I seal a cracked driveway or sidewalk?

Clean the crack, add closed-cell backer rod if it is deeper than 1/2 in, then fill with a self-leveling sealant such as Loctite PL S20, DAP AMP Self-Leveling or Sika Self-Leveling Sealant. All three are for horizontal surfaces only.

Will these stop water coming through a basement wall?

Zinsser says WaterTite stops up to 34 psi of water pressure and is ideal for interior basement walls. Okon W-2 and Seal-Krete Original do not stop hydrostatic pressure, and Seal-Krete is not for below-grade use. See Masonry & Block Waterproofers.

Do I need to etch concrete before sealing?

It depends on the product. Rust-Oleum says Okon Seal & Finish does not require acid etching. Valspar says to clean, degrease and etch bare concrete before its Concrete Bonding Primer.

Build the full project cart

Use this collection to choose the core product, then add the prep, applicators, cleanup, and finish supplies from Weekend Project Carts. For a common starting point, open the Paint Cabinets Project Cart, or read the Project Guides.

Find a project cart Read Project Guides