Watco Powerfloat Sealer

WATCO says it’s rewritten the rules for painting or sealing smooth concrete – eliminating the need for expensive mechanical preparation.
How to paint a hard, smooth concrete floor is one of the most common questions directed to the Watco technical team.

Power float or polished concrete is extremely hard and dense and this can pose real problems for painting or sealing. The smooth hard surface is achieved by a power float machine, something that looks like a large garden lawn mower with a series of rotating blades underneath that smooth out and polish the partially set concrete surface.

The result is ultra-hard and smooth, ideal for coping with heavy traffic in warehouses or showrooms. It’s also a much superior finish to the traditional hand trowelled floor.

But this toughness also makes sealing and painting tricky as there’s no key in the surface for the paint to adhere to, so the paint will peel off.

Tackling toughness
Most surfaces need a degree of absorption or texture to make the paint grip. For a power float floor, most paint manufacturers recommend shot blasting to open up the surface so the paint penetrates. This approach can work but many of the power float floor’s desirable, smooth, hardwearing properties are blasted away.

Acid etching is also recommended but this simply doesn’t work – if water or paint can’t penetrate the surface, neither will acid.

Watco’s advice for successful sealing is to simply apply two coats of a Powerfloat Sealer direct onto the floor by roller.

This, says Watco, gives a tough washable surface but it also enhances the attractive look of natural, polished concrete. The only preparation required is to ensure the surface is clean and dry.

Watco says its Powerfloat Sealer has an innovative formulation that includes special additives which will successfully bond with the smooth concrete surface, something that other sealers and paints simply cannot do.

This will retain the benefits of the smooth, hard surface, a virtually maintenance free floor, that will last and is easy to keep clean. A floor textured by shot-blasting can be difficult to keep clean.

Add some colour
If you want to paint the floor instead of applying a clear sealer, Powerfloat Primer can be applied directly onto the surface as a single coat without the need for any form of texturing, says Watco.

Once the primer coat is done, the floor can be finished with any floor paint to produce a hard, durable finish. The primer has adhesion promoting additives and also has a flexibility characteristic that prevents the paint peeling off in sheets, says Watco.