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It's possible that putting the part in direct sunlight and letting it get to that sort of temperature quickly might have caused the blistering. Unless made with pre-preg at an initial elevated temperature then parts won't have a great tolerance to heat and using a heat gun to try and flatten things again might not work and could well make things look worse, unfortunately
Ideally, after an initial days or so curing at ambient temperature whilst still in the mould, curing at an elevated temperature with a slow and controlled ramp should be undertaken if greater heat tolerance is needed. All this without removing the part from the mould.
Of course, this would require an oven of the required size with facility to control the temperatures accurately.
Exposing the newly de-moulded part to temperatures of 50 degrees and up in direct sun is likely to lead to cosmetic issues, as would repeated exposure to high under bonnet temperatures without a controlled initial post-cure.
Even a controlled ramp up to the maximum recommended heat for your resin system is likely to leave evidence of shrinkage across the part, but this could be sanded and finished after with clear coating.
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