Subject: Re: Help with refinish

From: [email-masked] (Chris Kantarjiev)
Date: 23 Sep 1996 20:18:12 GMT

Any thoughts on - how to avoid the rust?

Dupont MetalPrep products are a good product for this; they remove
light surface rust and coat the surface to prevent rerusting at the
same time. Find it at your auto paint supplier.

For sheetmetal, I would have used something other than silica sand; glass 
beads would have been a better choice and caused less surface damage.
A good primer will cover much of the damage, anyway.

An alternative approach would be to just paint it with POR-15,
which will seal any existing rust and leave a very durable finish.

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From: [email-masked] (Marlin Cohrs)
Date: 23 Sep 1996 19:08:55 GMT

I sure could use some help mfrom you folks with some knowledge of surface 
teatments.  I purchased an old lapidary machine where the finish was 
deteriorating and rusting.  The machine is basically a semi inclosed 
arbor with 8" grinding/sanding wheels which are kept cool and lubricated
with water.  I assumed that I needed to remove the old finish and the 
rust, no small task given the inticate joins of the sheet metal.  I used 
paint stripper, then sand blasted, and then becuse the sand blasting left 
a very rough texture, sanded or used abrasives on as much as possible.  
They beast (about 36"x18"x 12" or so) still had some rust in the deep 
pits, so I used a phosphoric acid, KF, & organic solvet to get the rest 
of the rust.  It worked great on the small pieces, but on the body, by
the time i coated and rinsed one side, the other had already re-rusted,
although with a very thin surface rust. 

At this point I plan to sand blast it and prime with auto body primer and 
coat it with hammermil(sp?) hammer tone finish.

Any thoughts on - how to avoid the rust?
		- do I need to worry about the courseness of the sand 
blast or any residue from the slica sand?
		- is my choice of paints reasonable?
		- why did I start the project in the first place?

Thanks
Marlin Cohrs
[email-masked]