Dimples are not caused by dust. It’s either fisheyes or porosity in your part. Fisheyes are cause by surface contamination such as wax and grease. Porosity will cause what appears to be fisheyes but is cause by tiny pinholes in the surface of the part. Got some pics?
Are you using ANY silicone based sparys in your shop? (like WD-40)
Nope, i do but far away. also, i washed the part down with soap and water. the surf. is very smooth before spraying, not smooth but dimple free. i have tested it. i think i will run 1 -2 more coats to cover this up then sand down and buff. UGH!!!
Larger dimples are called fisheyes…they are from contaminants in your part…ie wax.
YOU CANNOT SAND YOUR PART WITHOUT GETTING THE WAX OFF IT FIRST!
The wax will get imbedded into the part by the sandpaper if you sand it off.
USE DENATURED ALCOHOL TO WIPE THEM DOWN.
doh! i didnt know that part! i thought it was only AFTER you sand. ok, so demold, dewax or take off ALL the crap, then soap and water, sand, clean again and soap and water again. then let dry. tack cloth, spray clear coat… gosh,
Using soap and water to degrease parts is really not a very good idea! Get hold of some proper pre-paint degreaser, and I think probably your problems are going to be over. Always apply this using new soft paper wipes, so you can be certain you are not using rags that have silicon on them.
Soap and water to remove basic contaminants such as sanding dust. Then a quality cleaner/surface prep.
if you have a gel coat why are you wanting to apply a clear coat? For some UV protection?
…just curious and trying to figure what way I should go…
it gives it an extra layer of protection and i dont want to buff or sand the gelcoat (afraid of hitting the weave )