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Well this one claims it only needs 6 cfm at 125, so I can manage that. 2 fenders, a hood and a trunk lid inside and out it a lot of square footage of area. Plus I don't want them manhandling the fenders as they are flipping them around to get all the inside rust from the inside of them. There's lot of surface rust and paint to remove plus all the sound deadening from the underside of the trunk lid.
A steady 6cfm at 125 is a fairly large compressor. More than a 2hp machine can manage.
My suggestion is to give up on the idea of a syphon feed and find a pressure pot blaster.
I am not particularly recommending this unit, this is just to make sure we are on the same page:
[urlhttp://www.harborfreight.com/cpi/ctaf/Displayitem.taf?itemnumber=95014[/url]
I note this one has a "dead man" valve at the operating end. Many of the cheaper ones simply have a gate valve.
The advantage of this, if you have a small compressor, is that you can stop occaisionally and let the pressure rebuild.
One problem with these is the moisture build up in the tank. Make sure you empty it before storing, particularly if you are using a media that absorbs water (i.e. baking soda). Even with sand, wet sand doesn't flow very well.
Don't use expensive media, a lot will be lost. Many people will recommend beach sand from Home Depot. I won't. It has a tendancy to clog.
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