There have been some debates on rec.audio.car regarding the use of silicone caulk to seal enclosures since the caustic fumes (acetic acid) released during curing have an appetite for foam surrounds, but with a little understanding of what is going on, this problem can easily be avoided.
Fortunately, most JL Audio subwoofers have a specially treated surround that protects them from hungry acetic acid fumes which is cause #1 not to be overly concerned with using silicone to seal your box. Secondly, the fumes are only released during curing (the time when the caulk goes from a free-flowing gel to an amorphous solid) so all you have to do to prevent damage to the drivers is to wait until the silicone has cured (8-12 hours usually) before dropping the subs in. As one member of the rec.audio.car newsgroup (who shall remain anonymous) can attest, it is not a good idea to stick your head inside the box while the silicone is curing unless you are in search of the world's most obnoxious buzz (don't try this at home kids).
