For floors with more widespread hairline cracks, chips or divets, apply a skim coat of no more 1/8 in.Fill with a two-component epoxy concrete filler and allow to dry according to the manufacturer's instructions.Ground out structural cracks using a tuck point diamond wheel, thoroughly cleaned and the crack blown out with a leaf blower until dry and completely free of debris.
Saw cut with a skill saw and a diamond blade if needed.Lay a piece of string in the expansion joint before applying the concrete overlay and pull the string immediately to reveal the expansion and allow cement overlay to dry for 12 hours.Make sure expansion joints are thoroughly cleaned and free of all debris before overlaying.Allow concrete overlay to cure for minimum six hours and sand using a 100-grit pad.Repair any slightly damaged areas such as carpet tack holes or similar imperfections with Concrete Patching Compound and sand flush with the floor before overlaying.RESURFACING CONCRETE FLOORS How to Avoid Concrete Overlay Cracks and Problems To spray the overlay, add up to one gallon of additional water per box of smooth texture overlay until the mixture resembles a thin pancake batter suitable for spraying at 25 psi.Ĭomplete texture overlay should be sprayed as a base-coat only. Ambient temperature will also affect pot life length with cooler temperatures marginally extending and hotter shortening the expected pot life.
Pot life for the overlay is approximately 45 minutes and can be extended by 15 minutes by using ice cold rather than room temperature water.If using colored concrete pigment, water should be kept uniform for every box of overlay to avoid color discrepancies.To thin the overlay during application, add water as needed up to a maximum of one additional gallon.For a thicker consistency, use less water.Thoroughly combine the water and overlay to insure the dry polymer is saturated and properly dispersed.
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