I have been wanting this kit for a while now, I knew nothing of Ayrton Senna(not really a open wheel fan) until ESPN did a program on him and it was very interesting. I am not sure why you can't just sand the clear part's just like you would any other plastic piece? I alway's start by washing my pieces with warm water and some dish soap, that get's the residue off, then a light sand and primer as you have mentioned. Good luck, look's awesome so far.