: Help: I've encountered an epoxy problem which I hope someone out there can
: help me with.

: Glassed and epoxied the hull earlier this past year (spring & above
: freezing, but not too warm) When sanding out the edge last night, to apply
: the sealing tapes on the hull/deck joint, I encountered the top layer of
: epoxy on the hull acting like varnish which didn't get a good bond. Today
: I've scraped one half of the hull, with the problem consistent from end to
: end.

: I'm using East System epoxy. I believe I got the 5:1 mix proportions correct
: based on the problem being on the entire hull. Epoxy was relatively new
: stock(at least to me) The outer layer, the last of the 3 coats, seems to
: flake off, leaving a smooth surface underneath.

: Any suggestions as to cause, and whether another finish coat of epoxy should
: be added again, and with what surface prep.??

: Thanks all for your help and suggestions.

If I read this right, you have the cloth and 2 coats that are solid. The 3rd coat is flaking off.
Maybe blush on the second coat?
Sounds like a good sanding, apply the seam tape, and fill coat as required ,may do the job.
You would put 1 or 2 fill coats over the tape anyway so you could blend it in to the hull and deck at the same time.
How long was it between the2nd and 3rd coats?

Terry