I considered that, but I'm hoping for a traditional sanding and filler process. We will see what the final material behaves like. I should have a sample coming soon
It's tough to sand well. It get's a little 'gummy' and hairs tend to stand up. Plus each layer is kinda like an M&M: hard on the outside, soft in the middle. So it doesn't sand really evenly. Takes a long time to get favorable results.
If you wanted to avoid the vapor polishing, I'd use a very high build primer and hose it down and sand the primer rather than the plastic. It'll take a lot less time and give a good base for the topcoat. Adhesion promoter to begin with, of course.
Since this is your prototype part, it might also be a good idea to try a few different things and see which works best for you - personally I hate sanding plastic anymore, so I just don't ;)
