For the dash i would use krylon and a clear coat over that.
2k clear coat over rustoleum enamel.
It s about 20 a can and well worth it.
I am not an authority on paint and i would never claim to be but i shot a 2 part urethane clear coat over rustoleum enamel on the roof of my 49 without issue.
I put a 2k clear from spray max over my 3 96 can of rustoleum and it turned out amazing.
Best part is it will be long lasting durable paint.
I ve had this happen with the rustoleum 2x stuff.
More coats can be applied any time.
Do not take this as a recommendation it is strictly something i heard about and do not guarantee it.
I used rustoleum clear coat over metalspecks which i discovered earlier the hard way that it s a laquer based paint and it worked fine.
Don t be like me though and use a single part clear coat gasoline dissolves it.
I have heard that you can use hardware store urethane for clear coat with rustoleum.
Clearcoat over some types of high.
I think the clear coat must be more laquer based and spraying.
Clear coat over rustoleum ppg makes a fleet enamel about 65 a gallon w reducer.
Dries quicker than enamel and is easier to rub out and compound in the long run.
Use a 2k clear.
At least 3 coats of your base color allow 1 day to dry between coats and wet sand with 400 to 600 grit then apply your clear coat the same amount as your base color same drying time and wet sand first with 400 to 600 grit.
I am using high performance rustoleum black glossy paint and krylon acrylic.
7 months of sitting in the sun rain and dirt looks like the day i shot it.
Provides protection from rust and corrosion.
Would be interesting if someone would try it and see how it works.
7400 system dtm 450 voc alkyd enamel rust oleum s original rust preventative direct to metal dtm coating.
In fact i shot it over the old paint and rattle can primer spots without issue.
Just stick with the normal gloss protective enamal and crystal clear enamal.
I use spray max 2k clearcoat.