According to charlie :

"S. Barker" wrote in message
...
Well the granite clearly has problems with hot pots and losing it seal,
and bacteria. Etc. I can only assume (i know, i know) that concrete has
similar problems with the hot pots breaking the seal.

that is not correct. heat won't affect the sealer whether it's on concrete
or granite.

Depends on the sealer used, how hot the pot is, and how long it's left.
Yes, the stone conducts a lot of heat away, but if you apply enough of
it for long enough, bad things can still happen.

For example, epoxy (it's mentioned as an option in a number of DIY concrete
counter books) used as a sealer will discolor and/or cloud up at 150F, and
start to do nastier things above 300F. Heck, I got epoxy to cloud up with
140F water.

Some professional counter people claim to be using sealers that are impervious
to high heat. Others don't.

It looks like some of the web sites talking about granite and hot pots are
talking about the material _without_ sealer.
--
Chris Lewis,

Age and Treachery will Triumph over Youth and Skill
It's not just anyone who gets a Starship Cruiser class named after them.