Take it back to the shop you had paint it. You normally receive at least a 5year warranty on paint work. Polyurethane is very hard to get paint to stick to, however, I do not think that is the cause of your problem. I feel it is more related to the work performed by the shop.
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95 Nissan Pathfinder SE-V6 with I.C.E.
98 Yamaha YZF600 with a D&D Slip-on pipe
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