Paul
As previously stated only a few silicone caulks remain that are acid curing.
And those that do will cause you no harm. silicone caulks however will not
accept paint over top of them. Yes, you can spay it over but it will come off.
Butyl caulks generally never set up. They remain pliable forever, or at least
till you rub up against them and smear them. once you paint over them they
are still soft under and may interact with the paint.
My recommendation is to use a latex or polyurethane type caulk. These do set
up to a pliable state and will accept paint over top after they have cured.
they lost popularity in the construction trades when silicone came along and
show greater resistance to UV exposure. Of course most caulks where not being
painted over.
good luck
Frank Fisher
Temecula
California
58 TR3 TS41366L
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