Plywood boat and fiberglass as sealer?

[lobsterman]

Hi all,
Can epoxy resin be used over poly ???, I am building a 12' stitch and glue skiff, and i have done the bow and transom seams with a filler and covered them with f-glass tape with poly resin (the twisted copper stitches were left in, and encapsulated in this). I have yet to filp it and install the bottom sheets, (as i am working outside and the weather has not been too cooperative yet ).
But after reading all the benefits of epoxy rather that poly i am wondering if i could do the exterior of the hull with epoxy now that i have already done a few seams with poly ???.

P.S. years ago i had fiberglassed over a 20' lobsterboat with only poly resin + mat, and i had used a marglass short strand filler on all the seams before glassing it, and it seemed to hold up quite well for the next several years that i owned it.