Compressor questions

Hi,

Looking to get a compressor -

http://www.screwfix.com/app/sfd/cat/pro.jsp?id=81393&ts=32997

and i have the option of getting one with a 6 litre or 24 litre tank. I did a search of the forum and couldn't see a clear answer, so how long would a 6 litre tank last on constant spray? I'd prefer to get the 6 litre one as that means more money for models :)

Also, do you guys know anywhere in the UK i can get a water/moisture trap for a compressor? I've looked on the web and had no luck so far :(

Thanks

How long a tank of air will last depends on several factors, it's impossible for anyone to just sit here and say 'it will last X hours'.
It's a complete variable which will be effected by things such as nozzle size and spray pressure, all that can be said is the larger your tank, the longer it will last.