On 1/16/2012 5:37 AM, Norminn wrote:
On 1/16/2012 3:20 AM, Daniel Prince wrote:
wrote:

On 1/11/2012 4:25 PM, Daniel Prince wrote:
I have a cooktop mounted into a ceramic tile countertop. I have
caulked it several times but after several months the caulk comes
loose. I clean the surfaces with detergent and then with rubbing
alcohol. I use silicone caulk.

Is there a better way for me clean the surfaces? Is there a caulk
that would be better for this use? Thank you in advance for all
replies.

rubbing alcohol sometimes has traces of oils in them. try using acetone
instead.

I have some 70 percent and some 99 percent rubbing alcohol. Is the
99 percent less likely to have oil in it? Is there any way I can
test my rubbing alcohol to see if it has oil in it?

Am I correct in assuming that nail polish remover would not be good
for this use?

Good grief! Oil in rubbing alcohol? Can't be enough to matter. I keep
denatured alcohol on hand for solvent/degreasing. Nail polish remover
normally does have some oil to counteract the drying effect on nails;
it's not a great solvent to use on paintable surfaces.

yes.

from wikipedia:

Isopropyl rubbing alcohol USP/B.P. contains 68–99% of isopropanol
(isopropyl alcohol) by volume, the remainder consisting of water, with
or without color additives, suitable stabilizers, and perfume oils.


99% doesn't usually have the additives that the 70% does.