http://www.forrestrace.com/grinder-stained-2/
Questions about concrete stamping for patio?
I have an existing concrete patio that I want to dress up with a stamp and stain. The patio already has an epoxy paint finish on it that is pretty worn. My question is, can I put the layover right on top of that epoxy, or will I need to use a grinder to take down that surface first for better adhesion? Thanks for any helpful suggestions!
Your question will require a 2 part answer.
1) if you are going to apply stamped concrete over existing than there will more to the preparation of the base (existing concrete) than just sweeping and putting a hose to it. YOU MUST remove the epoxy coating first, this can be done by grinding it off. Even though some stamping applications comes with bonding agents, this will not guaranteed adhesion to the base. some de-lamination will occur and repairs will be impossible to match (if existing epoxy is not removed).after grinding off the old epoxy you can do two things to finalizing preparation of the surface.
a) use muratic acid and water . use 1 part acid and 3 parts water. this will loosen any dirt and insure proper adhesion.
b) use 2000 p.s.i. power washer
2) If you are going to use stain i,e. acid stain, Than you must also remove the existing epoxy, only the epoxy must be removed using a another process. use a epoxy remover, after the Epoxy is removed, than finalize the prep work by using a power washer. The reason you want to remove the epoxy is that the satin will not take , becouse the surface is a artificial surface and not natural, acid stainig is made for bare concrete.do not use a grinder becouse the grinding will show thru.
sorry if I misspelled some. spell check here is terrible
hope this helps,
Good Luck
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