I would never coat a slate, too slippery and will cause
spalling. Most solvent based silicone sealers will color enhance slate just
For cleaning, try a 80 grit Tynex brush, very fast and aggressive
and leaves a beautiful finish.
do you know if it is an acrylic based sealer, if you can find that out or do a pull test you can apply some very durable top coatings i live in utah and we apply some coatings that are bomb proof, also we run into this problem alot where the customer is trying to salvage a coating and we have had some really good results, i can give you some ideas on how to test to see what type of coating is on it know.
Stone Surface Specialists
On Mon, Apr 12, 2010 at 6:48 PM, John Freitag <firstname.lastname@example.org>
I would recommend a impregnating sealer.
DO NOT use any topical sealers. Do a good cleaning, recommend using some
250 or 400 grit honing powder when cleaning this will give you a clean fresh
looking surface then seal it
John E. Freitag
The Stone and Tile School
I am looking for a good sealer for slate that would be
applied outside around a pool area. The home is located on the
beach. The slate has not been taken care of for the past 10 years, some
areas are degraded and peeling. The owner would like to get a couple more
years out of it before replacing. There are some areas where water may
sit for a couple of days. Any suggestions would be appreciated.
Excel Stone and Tile Care
San Diego, CA