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Clear powdercoat on rusty frame

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Clear powdercoat on rusty frame

Old 06-15-10, 01:26 PM
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ColonelJLloyd 
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Clear powdercoat on rusty frame

I recently purchased a 1987 Schwinn Voyageur (full-on touring bike). The components are great (Deore and Biopace triple), but the frame has several rust spots in the usual places (around the headset, cable guides, BB lugs and especially the fork crown). I am going to have it powdercoated by the guy my LBS uses and at a very good rate. He blasts the frame and preps it for powdercoating. It'll be cheaper if I use a color he already has on hand and clear with some metal flake is one he has.

My question is this, should I have him sandblast the frame, then pick it up before coating to finely sand the frame and lugwork or will the blasting be sufficient?

Anyone have experience with clear powdercoat?

Also, I plan on using Frame Saver. Should I spray the inside of the frame AFTER the powdercoating job?
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Old 06-15-10, 01:47 PM
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clear PC is the one clear finish that might provide a good enough barrier that it won't immediately start rust-blooming under the paint...but to do this right you should have the PC done right after the blasting, any time spent between (and especially touching the raw steel) will compromise the finish.
Use Framesaver afterward.
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Old 06-15-10, 05:21 PM
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The only clear powdercoated bare frame I've seen was a well worn Bombadil outside the Rivendell shop. The frame had not been blasted, just roughly sanded. It had a gold tinge to it, as if the clearcoat had yellowed. lots of brass was visible around the lugs and I could see where brass had been sanded off from places it didn't belong. I didn't see any signs of rust. It was interesting, but it's not a finish I would want have on one of my bikes.
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Old 06-15-10, 07:39 PM
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Thanks, fellas. I suspected that it should be coated immediately. I live in Louisville, KY and it's pretty humid here. I'm aware that brass will be visible around the lugs (on the frames I've seen I dug it). I'll have the painter call me to have a look once he blasts it and I'll inspect the frame. If it's nice and smooth I'll do clear. If not, I'll go solid color.

Good news is that the LBS that uses this guy already has him doing a restore in clear. I'll be able to view his work before I decide.
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Old 06-15-10, 07:55 PM
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I've seen a few clear powder coated BMX bikes, it looks interesting, but doesn't appeal to me either. A very fine grade of media blasting might give it a nice polished look, a more aggressive grit will result in a dull gray surface. Polishing the tubes would be ideal, but the time and handling involved would probably lead to microscopic rust getting a foothold.

Here's a wrench that I blasted with aluminum oxide (a coarse medium for heavy rust removal,) I don't think this would look great on a bike:

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Old 06-15-10, 08:30 PM
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although i have no experience in this area, i would imagine clear powder on a touring bike is not optimal. since you are getting a good price, you can always get a good price next time too i suppose if it doesn't work out. please post before/after pics.

here's some inspiration:
https://www.flickr.com/photos/2567121...7604736650031/
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Old 06-15-10, 10:24 PM
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I guess I've seen too many frames in the raw to be too impressed by clear-coating a raw frame. I always wondered about the clear coated rivendell frame, the precipitated carbon (black spots) generally come right off. So I would think that it would be pretty fragile at those places. I can't imagine clear-coating a sandblasted frame. A Schwinn Voyager and a lot of other production frames were made with the express notion that a lot of flaws were going to be covered up by the paint.
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