I used to swear by Squadron green putty - until the last tube I bought, and I couldn't get rid of the pinholes, even after several applications! After buying a tube of this stuff, no more pinhole problems, finer grain, sticks well to plastic, wet sands easily (I never dry-sand on plastic). Caution: Will probably mar the plastic finish if you get it where you don't want it, but that's what makes it stick so well.