A decade or two ago, I used a clear-coat (boating/marine) lacquer/sealant mixed with ultra fine grain sand (3to1 mix ratio),painting it in two coats once every two years ,allowing dry/cure time . To solve dangerous issue of wet porch tiles being slippery after winter night rains. I'm acutely aware slips,trips & falls are leading causes for house &rent dwellers to be rushed to E.R depts with leg n hip injuries or fatal head injuries.. Is there a product ready mixed solution available at bunnings.