On Jul 13, 12:33*pm, Josh wrote:


.snip

*I'm not wild about trying to scrape it off
because of the possiblilty that it contains asbestos.

snip

Odds are the old tiles were compounded with asbestos, not the mastic.
Easy to test if you care to. Pot a dab on a stainless steel teaspoon
and light it off with your propane torch. The residue will clearly
display the characteristic fiber structure of asbestos if there is
any. An anonymous white powder would likely be limestone, silica, or
clay mineral filler.

Joe