There are lots of different kinds of clearcoats to choose from....I really don't know which is the best....
I choose this water based polyurethane....in a HVLP spray gun...
I have tried on Royal Flush, I liked it very much, it's very smooth and totally flawless, no orange peel finishes....and I didn't do anything after 3rd and final spray job, no sanding or polishing...nothing!
Colors looks good.
I add a little bit of water to make it thinner....to avoid an orange peel finish...but be careful.....easy to bleed!!
Polyurethane is very thin, at least 3 coats to complete.
It dries very fast, best to spray is on cool day (very early morning in So Cal), make sure the whole coat stays wet before finished spraying job.....otherwise, you'll see different sheens.
To knock down the artwork edges with polyurethane is probably 6-8 coats which is too much, that's why I choose 2PAC.
Testing on a kitchen sample door.....
First coat of polyurethane......
Close up detail of first coat....
Inside rails.....see the fine orange peel finish? it's from the rust-oleum painter's touch ultra cover spray can - blossom white... not from clearcoat.
On non-2PAC surfaces, I'll sand lightly between coats to eliminating orange peel finishes.
Ahhhh look at that 2PAC side...no orange peel finish!! ....and of course, no stencil edges!
It's a semi gloss finish.
After dry, it's time to sand (dry) to deburr the edges of 2PAC....very carefully...hard to see, just feel it with fingers.....don't sand too much, will sand again on second coat.
(see blue lines)