To bring things up to speed, after letting it hang and harden right up for a week I sanded the first epoxy coat back to wood with 120 grit with a random orbital and by hand in the tricky bits, then smoothed it somewhat with 320 grit again with the random orbital.
Then I re epoxied using my hands again with nitrile gloves on. After hanging for yet another week I hand sanded the entire thing with 320 grit. As its epoxy I've used as a sealer and primer on this one I am leaving it at 320 to allow the clear coat more sdhesion. I'm still experimenting with this epoxy product and seeing what it is and isnt capable of, but I have a gut feeling that if I level it much more than 320 then de lamination of the clear coat risk is increased. Besides, the clear coat fills the 320 scratches quite nicely.
After the sanding and before the spraying, I Prepsol'd the entire guitar. Prepsol is a special wax and grease remover by PPG for use during the paint process. For anyone who has never used prepsol, its important to use, yet if you dont wipe it all off, then your paint can delaminate, as if you leave an invisable film of prepsol on the surface then your clear coat adhesion is hindered. I once spoke to a spray painter who was painting a commercial aircraft where the apprentice prep guy didnt wipe any of the prepsol off properly. An entire aircraft had to be sanded and resprayed!
This is a clear coat I started trialling last year and I've been using it since. It's meant to be a top shelf European product as opposed to the USA and Australian brands I usually use. Once I adjusted to the different way it sprays I've been getting great results from it.
The first of the final session of two clear coats: