MDF Nontoxic Sealant
Hello. Wanted to know what type of nontoxic sealer people are using on MDF speaker cabinets. I've built a vented sub out of MDF, added some enamel flat black paint and now feel made the mistake of using spraying adhesive to glue in the foam fill. I used the product called 3M General Purpose 45 spray adhesive. The can says 65% VOC's and after applying following instructions, still caused some issues affecting my eyes and throat. In retrospect I should have never used something so toxic. I've since taken out the foam fill and allowing the box to off-gas for a few weeks in the garage.
Trying to keep the VOC's, formaldehyde and any other toxic gas out of the house as much as possible, at this point, what's the best solution to "seal" the MDF, paint and remaining adhesive? I've heard of several methods, shellac (buy the flakes and mix with alcohol), water diluted wood glue (50:50 mix or similar), commercially available product such as AFM Safecoat - Safe Seal, etc. What's the best performing, least toxic, cost effective product people have used for this purpose?