What Tg supposed to be effective for interior parts?hot greek sun can touch 40-45+ at a sunny day!

In the hot sun dark coloured interior parts can get above 60C. The average pain threshold for temperature for most humans is around 54C yet even here in the "sunny" UK it is common on a hot day to find it initially painful to sit on or touch black leather interior trims or metal gearknobs

You will find most effective post cures will go upto or very close to the target heat distortion temperature. So if you want to achieve a 140C Tg on your resin (if it is suitable of course) then your post cure will likely hit at least 120C.

Your resin manufacturer should be able to give you a postcure schedule for the resin system.

Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant

The guy at the shop tell me to slowly raise the temperature and stay at the target temperature for a few hours,he didnt seem to know a tds,i found at the web some pdfs for the megapoxy 132(epoxy that i use)and they not say anything.

Take it in gradual steps for example, 2 hours at 20C, 2 hours at 40C, 2 hours at 60C and then say 6 hours at 80C then allow to cool naturally.  That should bring you upto 80C.  You have to do small steps when postcuring rather than just jumping to a high temperature because you are trying to avoid the resin softening (which is what causes the print through in your case it seems).

Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant