I was testing different techniques for using Mirror Coat. I had filled the pores and had put on a skim coat of mirror coat. While it was curing I finished sharpening my chisel and had sprayed WD-40 on to prevent rust. The next day I sanded the skim coat and proceeded to put on a normal layer of Mirror Coat. I was late for a meeting so left right away. When I got home this is what I found. It took awhile to remember spraying the WD-40 onto the chisel and missing the first time. Thinking back I believe the test piece was in the direction of the the errant spray. It’s a good thing it wasn’t the 12 foot conference table I was about to finish. I’ve had this happen refinishing stuff with silicon in it and it looks just like this. According to WD-40 it contains no silicon but it sure messes Mirror Coat. Should have wiped it down with mineral spirits.
Test sample with WD-40 mistakenly sprayed on it. Previous test piece in background without filling grain.
Btw, I’ve tried a lot of products to prevent rust on my tools, in Hawaii with it’s salty humidity it’s a huge problem. I’ve tried waxes, oils like camelia and other “rust proofing” products but WD-40 has been the best so far. I read an article recently in I think it was Fine Woodworking that did a pretty extensive test on rust proofing products and said that it was among the best products out there. There were other products that were really good but I tried to find them but couldn’t find them in our local stores.
-- Wood Menehune, Honolulu