Is shot blasting or grinding better for removing curing compound?

Shot blasting, in most cases. AECOM calls it the best way to remove a curing compound and says grinding does not work well. If you grind, expect the compound to load the diamonds and grind wet for the first pass or two.

Can you remove curing compound with acid?

No. LATICRETE says chemical removal of curing compounds using acids is not recommended, and Diamond Vogel says acid etching generally does not remove chemical curing compounds.

Can a chemical remover strip curing compound before flooring?

Some compounds come off with the maker's remover. Check your adhesive warranty first: Milliken's LVT adhesive warranty excludes chemically cleaned substrates and slabs where adhesive removers were used.

How soon can you remove curing compound from new concrete?

W.R. Meadows says hydration takes at least 21 to 28 days and that removing the compound too early defeats its purpose. Some flooring makers want it removed after initial cure, so follow the flooring spec.

How do you know all the curing compound is gone?

Run the water drop test across the floor. Drops should darken the concrete and soak in quickly. Then do a bond test with the adhesive or thinset you plan to use.

How to Remove Curing Compound From Concrete Before Flooring

Removing curing compound is a mechanical job on most flooring projects. The chemical and wait-it-out options exist, but they come with limits that tile and resilient flooring makers do not accept. Start by confirming the compound is there with a test for curing compound, then pick the method by product and finish.

What is the best way to remove curing compound from concrete?

Shot blasting. AECOM’s flooring bulletin says “shot blasting is the best way to effectively remove a curing compound (grinding doesn’t work well).” LATICRETE’s TDS 154 says to scarify “to a depth below the penetration of the curing compound” by shot blasting, bead blasting, water blasting or abrasive blasting.

Method	Best for	Watch out for
Shot blasting	Large open areas under tile, LVT, sheet goods or underlayment	Edges and corners need a grinder or hand work
Grinding	Edges, small rooms, polished floors	Compound loads the diamonds; grind wet first
Hot water pressure wash	Dissipating cures in shaded areas, some wax cures	Fails warranties that require mechanical removal
Compound maker’s remover	Resin cures and some cure and seals	Some adhesive warranties exclude chemically cleaned slabs
Waiting for UV and traffic	Exterior slabs in full sun	Does not work inside a closed building
Acid	Nothing	Not recommended by LATICRETE; does not remove compound

Is shot blasting or grinding better for curing compound?

Shot blasting for open floor, grinding for edges and finish work. On a 60,000 ft² (5,574 m²) polished floor, Concrete Decor reports a dissipating cure that was put on heavy and never broke down under the roof. It built up on the diamonds, and the fix was to grind wet for the first pass or two.

Diamond Vogel’s surface preparation guide targets a 3 to 4 mil (76 to 102 µm) profile from shot blasting for coatings and says to hand abrade areas the machine cannot reach. For tile and resilient flooring, follow the profile the adhesive maker lists.

Can you remove curing compound with hot water or a chemical stripper?

Sometimes, depending on the product. W.R. Meadows’ removal bulletin says to start with the method least harmful to the concrete and test a small patch first. For resin cures it uses its coating remover, applied 1.5 to 2 times thicker than the coating and kept moist.

The same bulletin says a typical ASTM C309 Class B or cure and seal coat “usually takes one hour” to soften, with some taking up to 24 hours.

Wax-based white pigmented cures may need water blasting, sand blasting, shot blasting or sanding. For hot water it gives 1,000 to 2,500 psi (6.9 to 17.2 MPa), starting low, at 150 to 160°F (66 to 71°C).

Some makers sell a remover matched to their own product. Euclid’s Kurez RC-Off is a cleaner for removing its Kurez RC and RC-100 cures without waiting on UV or traffic. Use the remover the compound’s own maker names, and get the next product’s maker to approve it.

Should you use acid to remove curing compound?

No. LATICRETE says “chemical removal of curing compounds using acids is not recommended” and that acid should not go into public drains. Diamond Vogel adds that acid etching generally does not remove chemical curing compounds. You get a wet, contaminated slab and the film is still there.

Will a dissipating curing compound come off without removal?

Outdoors in full sun, often yes. Indoors, plan on removing it. W.R. Meadows says dissipation “will depend upon your UV exposure and abrasion,” and AECOM says relying on UV is not feasible except for exterior concrete in the sun. See dissipating curing compound for how those products are meant to break down.

When can you remove curing compound from a new slab?

After the slab has had its cure. W.R. Meadows says hydration “takes at least 21 to 28 days” and that pulling the compound off too early defeats the purpose. Milliken, by contrast, wants compounds removed “immediately after initial cure,” so the flooring spec and the curing spec need to agree on timing.

After any wet method, let the slab dry before further prep or moisture testing. W.R. Meadows warns the surface is extremely slippery after its remover.

If the slab still beads water after removal

Rework those spots and retest. Missed areas are usually along walls, at columns, under old equipment and where the cure was put on heavy. Run water drops on a grid, mark every spot that still beads, and grind or hand abrade it until drops darken and soak in.

Then do a bond test with the real adhesive or thinset. AHF’s Floor Expert guidance uses 72 hours as the point where a failed bond means the compound must come off. For the full list of what flooring makers require, see curing compound and flooring adhesion. For coatings and polish, see prep before epoxy, tile or polishing.