Best RTC epoxy for body panels, hoods

I have been using Aeropoxy, it is good, but seems to take a while to fully cure. I have noticed that after 2 or more weeks a part finally gets stiff. I was wondering about heat distortion from the sun or engine heat also. I have a good source for modified acrylic resin, but really woried about its quick set up and possible low temp distortion. Any issues with this???

most epoxys have different cure rates. I have an epoxy that is super fast cure and can completly harden in 6 hours, but your work time is about 12 minutes. Which is perfect on the parts I am infusing cause the parts infuse in less then a minute