: Would CPES be appropriate to use as a sealant to prevent outgassing? Is there
: another material which would do a decent job of this. I have a wood heated
: shop and a cold climate. Unless I heat the shop a day or so in advance,
: outgassing is a major pain.

CPES probably works as well as anything, but treat it as you would blush and rinse off the surface with plain water and dry it off before glassing.

Besides a surface sealer, it's always a good idea to apply the glass with falling shop temperatures, to prevent outgassing.