It's almost next to impossible to find a shop that REALLY will guarantee that the clear coat will not fail if it is sprayed seperately .
Basecoat has a given flash time , and then they spray the clear which adheres to the base because it is still chemically bondable . It hasn't reached it's full film when they clear .
One thing that would be possible , but unless the shop is VERY familar with the exact formula of paint that the car is sprayed with I doubt they would touch it .
It would be a complete flattening of the clear , paying special attention to when the nibs and pits are gone and the base is BARELY touched . Then sanding with 400 grit on edges and such which are prone to lifting , and a scuffing gel used where defects arent present . They would then spray what is called a flow coat 1st ( overreduced - will take LONG to flash but holds better ) , then the UV clear layer , then another flow coat lastly .
BUT
It would actually be easier to simply sand the whole car down and respray base/clear in the original color with 3m soft edge tape in all of the crevices for a good blend on no overspray .
I could do it , but I no longer work at a shop , I just know all about it to this day ..
I really do think it should be covered under warranty though . Looks like solvent pop , where they sprayed the clear too soon and the base gassed out - bursting the clear .
Could be likened to air bubbles rising to the surface if you want a clearer picture
Finish couldve also gotten wrong reducer for temp and / or been force dried