I have seen a couple ways of people doing it and still a little confused what is the best method. I am make a couple small things but the contours are a little complicated. I normally was using a VER gelcoat and let that tack and then lay they first layer but I want to make these without the gel coat and clear coat afterwards. I've seen people spraying a mist of resin on them to get a tack so the first layer will stick or people using a spray tack like super 77. My question if I PVA the surface of the mold then use a tack spray will that show on the surface of the part??  and if it does will I be able to clean it off so I can clear coat it. This might have been asked a ton of times but I searched a little and couldn't find a direct answer.  Also I am infusing with a VER RTM resin if that helps any