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Bike prep for powder coating(6 posts)

Bike prep for powder coatingMel Erickson
Jan 27, 2003 6:41 AM
How should a bike be prepped before it goes to the powder coater? Should I strip the paint first or let the powder coater bead blast it? It's an old steel frame that I'm turning into an SS.
re: Bike prep for powder coatingNessism
Jan 27, 2003 7:13 AM
I recommend sand blasting the frame to give it some tooth for the paint to stick to.

Good luck.

Ed
Chemical stripgreg n
Jan 27, 2003 7:37 AM
Take the frame somewhere to get chemical stripped. Sandblasting is fine, but it does take away some of the material as well. You can chemical strip yourself, but by the time you buy the chemicals, spend the time doing it, deal with the mess and the health/ventilation issues and then disposal, you're better off spending $25-$30 to have a place do it for you.
re: Bike prep for powder coatingCuervo930
Jan 27, 2003 5:58 PM
I would prefer to have the powder coater to do the bead blasting prior to coating. The advantage of letting them do it is that you do not need to worry about corrosion as it will go straight from the blast to the coating line. Whenever you use dry abrasive blasting on steel, the substrate will often start rusting in a very short time because you have removed all the protective coating and have fresh bare metal.

Glass bead blasting has several advantages over a chemical process, it is the safe for the enviroment, will remove existing rust and corrosion, can blend or mask scatches in the tubes, it will remove burrs in threaded areas - bottom bracket shell, glass bead blasting commonly used to stress relieve welds, and I sell blast equipment and medias and want more people using it (so I can earn bigger commisions to buy more bikes).
Do what the powder coater suggests?Kerry
Jan 27, 2003 5:58 PM
When I had a bike powder coated, I just made sure that any surface rust (paint bubbles, scratches) was gone, and then let them do the rest. The cost of removing the old pain was included in the price, and they didn't offer a cheaper price if you stripped the frame first.
The CO that did my 853 steel frameLone Gunman
Jan 27, 2003 8:40 PM
put the frame into the oven and cooked the paint off, it just flakes off from the heat, sort of like what would happen with a heat gun only not as hot. No chems, or sand. Just heat. He pulled it out of the oven and brushed off the paint. What ever was left over (if any) was chemical stripped off.