Stickers ?

[ClydeBuilt]

Being the owner of the worlds ugliest black plastic pit-box, I need some serious remedial artwork. Namely stickers.

Picked up a couple of sheets of Polaroid 'sticker paper' whatever that is?
Anyone ever used this, or is it crap?

What kind of sheets should I be using?
Do I need to refinish them after printing?

Sheets will be one-offs of various stickers Ive seen on the net, so there will be quite a bit of wastage I would think. Lucas Oil, TORC, mostly short course and 4x4 rock crawling King of the Hammers kinda thing.

Please understand from the off that I do not plan to 'sell' anything and the guys who do on here, could suss it pretty quickly on the usual forums.
So all tootsies being well avoided, can anyone offer any advice?