Analog film photography and cameras

Anyone here got a Polaroid? I've been using the PX 600 film, the silver shade is okay-ish but the colour ones are totally crap (as in, you can barely make anything out at all). Wasted a whole cartridge yesterday and didn't get a single viewable photo out of it, half of them were completely blank. Bit annoying as it's £2 a pop. Anyone got any tips? The camera and film is nice and warm, I've tried it with the light adjust set both to darkest and lightest, and I've been using a bit of cloth bluetacked to the front of the camera to shield it immediately.

When you expose it, put it in a very dark bag without any kind of light getting through, the blue tint is barely enough to prevent the light from going through and overexposing the polaroid, like this;

In fact, have you not read the instruction when you get your polaroid?