Every thing you need can be purchased at Lowes or HomeDepoe. I have been building with foam , depron ,and the blue Dow styrene ,and fan fold foam for about years . This is what works for me , not to say it is for everyone,but it seem to give me a very smooth ,slick finish. I start by litely sanding with 400 grit sandpaper and then fill dents scartches with DAP Fast'N Final lightwieght spackling ,do not go over board , remenber you are working with foam and dents ,and scartches will happen the more you handle it .When you are happy with the surface prep for primer ,wipe down with alcohol then tack clothe (do not touch bare handed after this,the oil off you hands will make paint fisheye or orange pill ). I have been using Krylon primer/sealer white #KDQ5149 and I thin it with Armstrong S-195 Underlayment additive,this gives it flexability so you don't get those little hairline cracks in you finish after the first hard landing. Thin the primer 50/50 with the S-195 mix very good with drill mixer ,then I spray 2 lite coats let it flash (dry) about an hour then litely sand with 400 grit sandpaper touch-up if needed ,and you are ready for paint. Wal-mart has craft paint that works pretty good but you can use anything or any kind of paint you what to now that it is primed .I use a LPHV touch-up spray gun (20.00 at Habor Fraight or other type store) and an airbrush , spray cans don't work very well because the propellent melts the foam. You can use the paint in the spray can just not the can ,take the paint out of the can.This might seem like too much work but the finish and comments at the field will be worth it. Cap231ex