by John Bohn
I have a flagstone patio of abut 350 square feet. After sealing it with a wet-look sealer it did as you predicted, had large grey splotches where the alkaloids were coming up from underneath. I have painstakingly removed all of that sealer and power washed the patio. Two questions: 1. How long should I have to let the patio dry before applying the Porosco sealer (Siloxane PD) you recommend? 2. How many coats of the Porosco sealer should be applied, and how much time between coats? I cannot find any info on the Porosco website about coverage, i.e. square feet per gallon.
Many thanks for your help.