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I used acid on one house. Pressure washed, acid, then pressure washed again and let it dry for several days. Then two coats of S-W Armour Seal. It lasted the eight years I was there with no issues. Very tough. I'm sure it's still fine another ten years later.
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Robert Callaway
PCA | Early S Registry | R Gruppe
1970 T Coupe, 1990 C2 Coupe, 2007 Cayman S
1962 S90 Coupe - Gone, but never forgotten...
1985 Targa - A distant memory...
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