I recently painted my tailgate, and would like to apply decals that spell "Chevrolet" across the raised letters. I purchased a set from Chevy Duty and the instructions are rather minimal, basically do not apply to a glossy surface and to burnish the edges.

I painted the tailgate with PPG DCC (acrylic urethane), so there is no clear coat. What grit of sand paper should I use to scuff the letters? Secondly, how should i burnish them once they are installed?

Finally, I've applied things like decals before, and have "floated" them on a film of soapy water & alcohol to get it into position and then squegeed the wetting fluid out to get it to stick. Is this recommended for these decals? Thanks

Isaac