Re: sand blasting

Posted by ScottyHOMEy on July 09, 2008 at 08:35:32 from (70.105.236.133):

In Reply to: sand blasting posted by Pat H. on July 09, 2008 at 06:35:57:

First thought is that if you have a professional painter backing you up, take his advice.

Peening is a term, at least as I understand it, usually reserved for blasting with metal (usually fine steel) shot, and better reserved for cast parts to bust deep rust. The blasting I've done on sheet metal where you want a fine finish, I've had excellent results with a mix of glass bead and aluminum oxide. Cuts the surface well without cupping too hard into the metal. On sheet metal, you get a dull matte overall when you're done is good, though it might look a little bright or shiny on the high spots. And it's reusable.

I got my grit from McMaster-Carr. Comes in 5-gal pails, though it's sold by weight so the pail ain't necessarily full. If you have the time, they also sell sampler packs, something like two-to-five pounds apiece of different abrasives, that you can buy to test out to see which works best for you before you commit to larger quantities for the whole job.

For paint, you're thinking right. You don't want to skimp, but you don't want to go nuts either. I went nuts on a pet project (family tractor . . . ) and went with a top-line auto paint (PPG Concept) that cost almost as much as all the parts that went into her, but wouldn't recommend that expense to anyone, and wouldn't go that route on any other tractor myself.

I would recommend, though, that you step up from the old alkyd chemistry of the TSC paint. DuPont and PPG have a good range of mid-line paints that are much more reasonably priced than the one I went with in that one case. Again, whether or not he favors a particular brand, your painter buddy will be a good source to recommend a mid-range formulation (acrylic enamel as an example) that will give you a good balance between durability (sticking) and tendency to fade (keeps lookin' good).

If this is your first time paintin' I'll just also add that the "fancier" the finish, the more skill or experience it takes to put it on right. I got a little overly-ambitious in tackling the Concept, and then went on to learn a lot about wet sandin' and polishin', to gt rid of my runs and ripples.

Good luck, and don't forget to bleed your air tank regularly and put a water filter between the hose and the gun!

Replies:

• Painting my M Pat H. 18:55:01 07/09/08 (0)
• Re: sand blasting Pat H. 09:23:49 07/09/08 (0)

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