I am toying with the idea of painting my 3 deck lids on the bed of my EXT. I'm thinking about using a spray filler so seal and also cover the textured finish on the lids to make them smooth. then painting them the same color as the vehicle. Would I need to apply a particular base to the plastic, or could I use the filler as a base and sealer? Also since they are plastic would you suggest adding flex agent to the filler and paint? I have talked to a few people who do painting and have received different opinions from I wouldn't do it to just use the filler and paint. Thank you in advance, hope to get some good information.