I went for three coats West System (slow cure) epoxy scrapped with cabinet scraper between coats (sand paper clogs and scrapping is alot faster in my opinion and probably a better finish). Then I think I used 3 coats of spar varnish - Original Yacht varnish - can't remember the make but you definitely need to leave it a week between coats - other variables seemed to be the relative air humidy and air temp ... cured better in drier weather... I am a novice at this stuff but it seemed to work out ok - guess I was lucky.
I hung the gun up from a light fitting in a spare room and used a small paint brush for epoxy and varnish - very thin coats of epoxy and I thought I was scrapping most of it off - this may have been the case but I got a very uniform coat.
Hung one way up then scrapped when dry (I shut the door for a few days - so minimal dust etc - window open for air etc) - hung the other way and another coat etc.
Obviously this takes a while... I was in no rush so it suited me fine. The gun is holding up quite well - but I have a few 'extra' holes from lead balancing efforts ! THese will get filled in at some point... more of an experimental first gun - learn by the mistakes...
Edward
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