One of the worst problems for Hobbyist Painters is dealing with off season painting. For some of us it is the extreme temperatures in the summer and for the rest of us is waiting too long in the fall and watching the thermometer drop below optimal temperatures.
I have heard a few people describe how they painted their vehicle in an attached garage with the door open to the home and a fan blowing the last cubic foot of warm air into their garage.
Other people setup oil coil heaters with no open flame heating their garage …

Plastic parts can be the most difficult areas on a vehicle to paint and keep looking good. The problem with plastic parts is that other then bumper covers they normally are designed to be impregnated with color and painting the surface is a restoration option.
In this question someone living in Phoenix, AZ asks about temperatures and how they can effect your body work and painting.