I've used dope on a fiberglass version. Takes a about as much sanding and cleaning prep and you don't get to use primer. The type of paint used doesn't matter nearly as much as breaking the gloss by sanding, giving the paint something to bond with, and cleaning any oils or release agents from the spinner prior to painting. Any composite spinner should be expected to have some residual release agents still in place so cleaning with alcohol before and after sanding along with soap and water after sanding after is a good idea.