Crazy.... I did all three of these with Rustoleum, & mostly 2X... Semi gloss white bases, no primer on base, & then 2X Apple red gloss on Nitro, with 2X Semi gloss black, on SBM I did Rustoleum 2X semi gloss white, Valspar "pool party" for blue, & 2X semigloss black.... Playboy was 2X Semi gloss white base, Rustoleum Satin Magenta, & then 2X Semi gloss black....

All 3 were done with same lead times..... I spray the base & allow 24 hours to set & then do my 1st color, then another 24 hour, the 3rd color goes onto of that. Only time I have had anything near that happen, it was on wobdrails for the PF, it was too thick of a 2nd coat, IMO it's the thinners in the second color attacking the base coat.

I just did Nitro in 3-4 days.....from start to finish.

It's gotta be your primer causing the issue. Strip it down to bare wood again, skip the primer, do your base Yellow, go light for 1st 2 coats both to avoid runs & to let it "soak" into wood. Do 3rd semi heavy, but not crazy heavy final coat to give good overall colorization & surface finish to the paint. I'd let that sit for 24 hours & do 2nd color. I like to use semi gloss wherever possible.... it dries a lot faster, less bleed around stencils etc. Plus, these machines were never intended to look more shiny than my brand new $50,000 car.... I don't like the whole clear coat look to a cab. But that's just me.

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I'm going to make you sick.....LOL

Last Friday night I stripped/sanded down the cab on my Evel Knievel.... Painted it White about 7PM Friday, Rustoleum Ultra 2X Semi Gloss white.... Saturday morning around 10 AM applied the Pinball Pimp Stencil, shot Rustoleum Ultra 2X Gloss Apple Red, 3 light coats with 15 mins in between them, Sunday afternoon applied last Stencil & shot Rustoleum Ultra 2X Gloss Navy Blue...3 light coats also with 15 mins in between.... pulled the stencil about 20 minutes after last coat & perfect as usual.... I don't blame you for waiting so long, especially with all the trouble you've had, but just pointing out to others, that it may not be 100% necessary...

Only other advice I can give is to make sure you are using light coats, so the solvents don't have time to attack the lower coat. Don't go thick until your final coat, & even then I don't go crazy thick, just enough to get the gloss level to where you want it.