Hi Dan you have obviously experienced the woes of using epoxy! There are lower viscosity epoxy's available or you can thin with acetone to obtain a better finish. I find epoxy is a fantastic product when used as a glue or as a thinned base coat but not very good for top coats.
There are various options available when over coating an epoxy base coat, if you really want a hard shinny surface & you dont own a compressor, take your gun to a spray shop & get it spayed with two pack or cellulose.
If you want DIY, two pack polyurethane marine varnish is a good product to work with. Like most things in life you get what you pay for & two pack is expensive with a short shelf life to boot. However two pack polyurethane goes very hard in a set time & can be polished smooth & shinny.
Maybe the easiest options would be an acrylic aerosol clear lacquer, available from car accessory shops.
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