[72YloSB]

I used spray undercoating on my '72 Super Beetle's trunk to prevent rust, and as undercoating usually is, it smears easily. I have now changed my mind, and decided to use splatter paint in the trunk. My question is now what should I do? I don't know whether to sand down the undercoating some, spray the splatter paint, and apply a spray clear coat, or if this too will end up smearing. Any ideas?