Micro blistering on Glass fibre cars?

[TV8]

I have had a couple of classics in the past and where external car covers are used, even with good quality and breathable covers, due to changes in temperature in the metal you get condensation and after a while micro-blistering on the paint.

I have just bought a TVR and whilst it wont rust, it doesnt fit in the garage and I wondered if I would have such a condensation problem with a plastic car or less of a paint problem with a surface that is lacquer finished?

Thanks in advance.

Graham