Blistering paint

I did an amateur paint job on an Allis B with TSC paint and it has been in a garage for about 10 years ever since. The paint wasn't great but the tractor looked pretty good. This summer I had to leave it outside covered with a cheap tarp. When I removed the tarp, there was a patch on the hood that was badly faded and blistered. I am wondering if this was the result of moisture which couldn't evaporate or did it get hot under the tarp. It was in the shade.
 
If you look at the fine print on those cheap tarps it will say not to cover painted surfaces with it. The heat and moisture built under the tarp is enough to lift most paints. It would have been better to use the tarp and rig a tent over the tractor not completely touching the equipment.
 
I think moisture comes up from the ground and gets trapped under the trap. I think you need to cover the ground with a tarp and make sure you have some air flow.
 
If you used a blue tarp they will not stop UV rays,if you lay one in the grass, the grass will keep growing.
 
Same thing happened to me a year ago with an old classic car I stored outdoors for the first time ever during the summer. It had a very good, but older, paint job. I covered it with a blue tarp in May and took the tarp off in September. There were 2 or 3 small blisters on the top of the right front fender. Bad deal. My fault. I blamed it on the heat buildup between the fender and the tarp which sat directly on the fender. Won't do that again.
 

What Stephen Newell said. I had it happen under the rubber roofing that I used to cover the knotters and bale chamber on my baler. Too hot for the paint.
 
I used tsc paint on my JD paint blistered where there was filler under the paint. the previous paint wasn't blistered .
 

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