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Need advice after sandblasting ???

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Need advice after sandblasting ???

Old 09-25-18, 07:15 PM
  #1  
cyclingarri
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Need advice after sandblasting ???



See areas around lugs should I sand down?
So Iím finally moving forward on a bike project. I picked up frame from sandblasting all the paint off. But Iím a little confused on what to do next. Iím looking at this frame and it appears to already have some sort of primer on it....??? No idea, should I clean it with mineral spirits (that was my plan)? Also should i sand down little rough areas around lugs? How about the inside of frame should I spray lube in there, should I spray paint to prevent rust...? What should I do? After this gets figured out here is my plan...
2 coats of primer sprayed that fills and is sandable
2 coats of primer sealer sprayed
1 coat of oil based enamel in GLOSS SAIL BLUE brushed on
wet sand
2 more coats sprayed on using preval system
wet sand
apply decals
2 coats of clear
wet sand
1 coat clear top coat
rubbing compound
polishing compound

anything I missed, any advice?
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Old 09-25-18, 07:22 PM
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Powder coat it.
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Old 09-25-18, 07:29 PM
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+1 on the powder coat. You won't be disappointed. It'll cost +/- $150 and be a WAAAAY better job that your amateur self can do with department store cans of paint. In fact...you might get a discount since it's already sandblasted. When I had a frame powdercoated the sandblasting was included in the price. You can apply decals yourself after that.

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Old 09-25-18, 07:30 PM
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Originally Posted by 02Giant View Post
Powder coat it.
Yep.

Mine was $100 for frame and fork and that included sandblasting.

If you've got the frame blasted, no fork, I can't imagine it'd cost you too much. I'd venture to say that it'd be cheaper than buying all things you mentioned in your original message.
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Old 09-25-18, 07:45 PM
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+2 on the powder coating. Faster, smoother and far more durable. Also, after it's powder coated, treat the inside of all of the tubes and stays with Weigle Frame Saver or Amsiol HDMP to prevent any additional internal rusting.
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Old 09-25-18, 08:17 PM
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Do not spray lube inside the frame until after it has been painted, you may contaminate the outside surface with oil and the finish will fish eye.
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Old 09-25-18, 08:30 PM
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I would have applied a phosphate rust preventative right after sand blasting, Navel Jelly works well. This would slow down the rust while you do whatever touch up finishing you decide on. Andy
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Old 09-25-18, 09:07 PM
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I don't think it's primered, that's just the look of metal after it's been blasted, any piece of metal will come out sandblasting looking like that.

I don't know a ton about painting, but 4 coats of primer? Seems excessive, what are you worried about, rust? You're in CA, you could ride that frame bare like it is and it wouldn't rust as long as it stayed dry and you didn't leave any fingerprints on the bare metal (assuming you don't live near the ocean).

With my bare frames, I had fun polishing them up, that cro moly looks like chrome if you take some steel wool and fine sandpaper to it, you can make it as shiny as knife or rifle barrel made of good hardened steel. Though if you want paint to stick, it's in the perfect state for that right now, that's why metal is generally sandblasted just before powdercoating. Which would be your least labor-intensive method if you have $150 bucks, and will yield flawless, durable, and professional results.. But if you just want something to do, 4 coats of primer is probably fine.

As far as what to do in the meantime, don't touch the frame with your bare hands. If you have, I would wipe the metal down with rubbing alcohol, and stop touching it. Fingerprints will often form into rust. And just keep it clean and dry and it should be fine for years.

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Old 09-26-18, 04:55 PM
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Good mask first

Acid etch primer first coat, then sandable primer

but rattle can, enamel, etc can be drop dead beautiful, but is is not any anyway as durable as Auto paint.

+1 for powder coat

or look for the automotive paint that is put into the cans by the auto paint dealer. Some can be catalyzed by pushing a button on the bottom of the can

all said and done this will cost more than most people would think,especially if you need to buy a $40/50 mask
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Old 09-26-18, 10:11 PM
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Originally Posted by cyclingarri View Post


See areas around lugs should I sand down?
So I’m finally moving forward on a bike project. I picked up frame from sandblasting all the paint off. But I’m a little confused on what to do next. I’m looking at this frame and it appears to already have some sort of primer on it....??? No idea, should I clean it with mineral spirits (that was my plan)? Also should i sand down little rough areas around lugs? How about the inside of frame should I spray lube in there, should I spray paint to prevent rust...? What should I do? After this gets figured out here is my plan...
2 coats of primer sprayed that fills and is sandable
2 coats of primer sealer sprayed
1 coat of oil based enamel in GLOSS SAIL BLUE brushed on
wet sand
2 more coats sprayed on using preval system
wet sand
apply decals
2 coats of clear
wet sand
1 coat clear top coat
rubbing compound
polishing compound

anything I missed, any advice?
That's a lot of prep and materials for a brushed finish

Last edited by Homebrew01; 09-27-18 at 10:04 AM. Reason: Removed insult
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Old 09-27-18, 01:35 PM
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Maybe this will teach you to make a plan BEFORE you sandblast.
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Old 09-27-18, 02:42 PM
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Originally Posted by wsteve464 View Post
Do not spray lube inside the frame until after it has been painted, you may contaminate the outside surface with oil and the finish will fish eye.
^This. I would also let the paint cure thoroughly first. Maybe 3 weeks, ask the painter as to how long.
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Old 09-28-18, 08:27 AM
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There is rust showing on that frame already. I'd wash it down with a phosphate product as mentioned earlier but understand, when you wash off the phosphate it will flash rust right away so I'd be ready with some isopropyl alcohol to help remove the rise water. After that, make sure the frame is good and dry and then hit it with a good epoxy primer. This catalyzed epoxy is excellent. Follow the directions on the can and then go direct to base coat next, followed by a catalyzed clear. Regarding base coats, I don't have any specific suggestions, just make sure it's compatible with the clear. There are various auto paint places that will put base coat into a spraycan, and there are also pre packaged products as well.

If you use catalized paints like suggested the durability of your paint job will be good. Use cheaper rattle can paint and it won't. Personally, I'd either do it right or just pay someone to do it right. The powdercoat suggestion is a good one. There is place in Gardena that powdercoats for cheap. I'm sure there are others. Ask for urethane powder if you want the best durability. Polyester powder is okay but not as tough as urethane.

Good luck
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Old 09-28-18, 08:46 AM
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Difficult to tell from the photo but it looks like the inside of the bottom bracket shell might have been sandblasted.

If so then the threads might be ruined.


-Tim-
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