I lost my old petrified rock when we moved. I used it as a nice looking coaster that fit my home's decor. I recently found another rock that is flat enough to work as a new coaster and look nice.
I have one problem though. Other than rinsing it off, I am not sure how to keep it from leaving gritty bits of debris on the table. I know I am going to need to do more than rinse it off and glue some felt on the bottom.
Does anyone know of any tricks to laminate/lacquer/seal a rock to keep the little crumbly bits from ruining my tabletop? Even advice on how to clean it better than just rinsing it would help.
2. some kinds of rock, like sandstone will just continue to fall apart
especially if you're using it as a coaster and it's getting wet a lot. Water is the most destructive force of erosion.
You can try sealing it with a penetrating sealer, or you can look for a different kind of rock like dark marble or granite.
but i would check out a tile store for some 4 x 4 polished tiles. most places will let you buy just a few pieces.
granite fabricators often cut scrap into small tiles. some also give away scrap.
teflon glides are the new felt.
I have a pretty good sized chunk of petrified wood that I put about 5 good coats of Deft on. it isn't super crumbly but it holds together nicely, and gives it a deep glossy coating. Deft aerosol is very quick drying.