If I'd taken advice from this site when I started 20 years ago I would never have started, and if I had, I would spent a fortune on too much equipment and too many chemicals. What a frightening picture is being painted. Been using 135psi and twin vac for 20years no problem. Secondhand van and machine and a few chemicals is sall you need. Its the care effort and thought that counts not top the range equipment etc that satisfies customers. Remember you could have a top of the range Steinway piano but it doesnt mean you can play it.
