I will have to look for another air compressor now, I have had an el cheapo model for years & it has been great for the things I was using it for, few air tools, bit of spraying, nail gun & blowing up the car tyres was about all it got used for.
Now I have built the blast cabinet it's just to small to handle the flow required at the correct pressure.
Still having read this thread at least I have a better idea what to look out for now.