How do I paint an outdoor concrete porch floor so that the paint will not peel off every winter?
Q: How to paint an outdoor concrete porch floor so that the paint will not peel off every winter? I have been sanding it ; applying a sealer recommended by the paint dealer ; and a concrete paint also recommended by the dealer. Yet every winter the paint peels off, and every spring I need to repaint the area? What am I doing wrong?
A: In response to your question on the peeling porch floor. The peeling could be the result of moisture, could be a clear sealer that is not allowing the paint to bond to the substrate or it could be that concrete is too smooth and the paint has nothing to grab on too. Without seeing it I can't be sure. I don't want to tell you it's one thing and it turns out to be something else. If you would like I can have someone come out and look at the porch and give you a recommendation. If you follow the surface preparation below and top coat with our porch and floor enamel or the H&C concrete stain that should correct your problem. Any questions call me @ 856-383-9101
Concrete and Cement Floors Concrete must be free of moisture as much as possible (moisture seldom drops below 15% in concrete). Test for moisture or dampness by taping the edges of a 2 foot by 2 foot plastic sheet on the bare surface (an asphalt tile or other moisture impervious material will also do), sealing all of the edges. After 48 hours, inspect for moisture, discoloration, or condensation on the concrete or the underside of the plastic. If moisture is present, the source must be located and the cause corrected prior to painting. All surfaces must be clean, dry and free of grease, oil, paint, sealers, etc. To clean,use H&C® Degreaser following label directions, rinse thoroughly and allow the surface to dry. Remove by washing with a solution of 1part liquid bleach and 3 parts water. Apply the solution and scrub the mildewed area. Allow the solution to remain on the surface for 10 minutes. Rinse thoroughly with water and allow the surface to dry before painting. Wear protective eyewear,waterproof gloves, and protective clothing. Quickly wash off any of the mixture that comes in contact with your skin. Do not add detergents or ammonia to the bleach/water solution. Scrape and sand existing peeled or checked paint to a sound surface. Sand glossy surfaces dull. Remove all form release agents, curing compounds, salts, efflorescence, laitance, and other foreign matter by sandblasting, shotblasting, mechanical scarification, or suitable chemical means. Refer to ASTM D4260. Rinse thoroughly to achieve a final pH between 7.0 and 10.0. Allow to dry thoroughly prior to coating. Surfaces must offer sufficient profile to achieve adequate adhesion. If the concrete feels like 120-grit sandpaper, the pores are open enough for this product to bond properly with the substrate. If the surface does not have this texture, etch the surface with H&C® Concrete Etching Solution first, following label directions. For very smooth surfaces (troweled surfaces with no porosity) use H&C Concrete Etching Solution at full strength. For smooth troweled concrete with some porosity, 1part H&C Concrete Etching Solution to two parts water should be used. Rough textured concrete does not need to be etched. Do not etch painted surfaces. Because water will collect in low spots and deposit etching and cleaning residue, it is recommended that the floor be vacuumed to remove any remaining water If surface deterioration presents an unacceptably rough surface, patch and resurface concrete. Fill all cracks, voids and bugholes with ArmorSeal® Crack Filler.
Contributed by Rick Brown - NJBA Member