I'm going to dry flake a trailer, I have the correct gun, and I'm going to hire a  compressor, does it matter what size compressor I get.

Compressors are measured in CFM (cubic feet per minute)

Normally your spray gun will have that as a reading. 

For the Flake King 1050

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This particular gun requires a normal size compressor to run and the minimum specification that we recommend would be a 2 CFM and 3 psi up to 20 psi.

You will also need to look at the spec of your gun you are using to spray your lacquer.

Cheers Gordon, that clears it up, I thought I could get away with a 2.5 cfm compressor, didn't fancy lugging a large compressor home