A fridge compressor won't give you much volume. They are designed to liquefy freon (puron or whatever). They can generate a lot of pressure but not at much volume. You will also have to squirt oil in it fairly often to keep it from siezing up and this will end up in your paint. I am using a big window shaker compressor for a vacuum pump but it sucks as an air source.
He is doing the same thing I am doing, using it as a vacuum pump. Since this involves a very small volume of air the oil take out is low. I just squirt a small spritz of compressor oil in from a spray can whenever I use it. If you just let it run in free air for a while it will puke out all the oil.
Get a disposable Freon tank. Up to about 100 PSI they are fine. actually stronger than that but we like a safety margin ;-) They come with a 1/4" flare fitting that can be adapted to almost anything with off the shelf fittings. Some even have 1/4" NPT threads on the valve to tank junction but they are rare these days.
Great idea but a traier tire might be an even better choice. They have some fairly large volume ones that still have a small diameter. They are also rated for higher pressures. You can usually get one for free if you talk to marinas or other places where boaters hang out, since the wheel and tire, mounted and ready to go is less than buying a tire and having it mounted.
You have to be careful taking an axe to a gun fight.
I've got a pond (wife raises fish) and she had a specialized low pressure, high volume "compressor" installed to put extra air into the bottom of the pond. It's not a blower style (the other type sold for this job), as she needed to push air to 12' down max. She says it's a rotary vane style compressor, and the mnfr says it has a 15 psi limiter on it. They say it's OK to use PVC schedule 40 2" pipe to run from the garage to the pond. Anyone want to comment on how low a pressure would be considered safe? I called a guy who installs tank bubblers in plating systems, and he says they use PVC, but the tanks are seldom over 6 feet deep.
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