"Joe" wrote in message
...
On Nov 21, 8:56 am, ken wrote:
we need to add new caulk to our shower floor, but the old caulk must
be removed first

What is the best way to do this?

thanks

Ken

You may be able to take advantage of the ability of methylene chloride
(StripEez or whatever) paint removers to swell and soften cured
silicones. If your substrate is plastic, however, that may not be
possible. Recaulking silicones with silicones works well because the
chemical bond is very good. In those cases, mechanical removal is the
best. HTH

Joe

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new silicone won't stick to old silicone. it's all a physical bond.