But we'll never know who the winner is now
Kevin, Indian sandstone - will you post a link to a suitable sealer for outside. I know I won't seal anymore but its for the outlaws. Please.
Teflon,
Invisible, breathable (imperative for sandstone as it percolates moisture from the substrate) , adheres by impregnation so no delamination ,No more fading or peeling as the coating becomes aged. ,
Water based because sand stone does not dry out enough to apply solvents ( outside), hydrophobic, oleophobic, Tested for 5 year wear life on horizontal surfaces (10 years on vertical), high spread ratio's, Areas can be used straight away (although it takes 24hours to cure) Paint ,felt Tip ,chewing gum etc, is easily cleaned from the surface.(look how easy your Teflon frying pan cleans up!......i could go on.
My mate makes it in the shed at the back of his house with products from some Italian outfit.
It's cheap as well!!!