You can use it or plastic pellets on paint over a gel coated surface. You have to be extremely careful, the paint is only marginally softer than the gelcoat, and in the resin glass/carbon fiber mixture underneath that the resin is quite a bit softer. So you can quickly blow a hole in your structure. If you use Garnet or CO2 to abrade the surface for later bonding, you have to use large volume low pressure i.e. 1/2" dia. nozzle at 20 to 25 psi. this requires a very large volume of air ,and most home builders do not have that capability. However you can rent a 40 to 50 cfm compressor from a rental company. If abrading for bonding the object is to lightly abrade the surface by keeping the angle of the gun low so that all you do is to remove a thin layer of the resin without tearing off the fibers and impacting the surface. You then have a prepared surface surface for bonding.Hi
Can you use dry ice blasting to prep a cured carbon/epoxy laminate surface for good adhesion of the next layer?