Priming and Powder Coating Yes or No?

[Whiplash]

The frame is at the shop to go into the tank. When it's out of the tank my plan is to have it primed. They'll prime inside and out to make sure no rust starts inside the boxed portion of the frame.

I thought I could just get it powder coated when I got it back and I'd be in good shape. However, a local powder coat shop told me that the primer would not stand up in the oven and that they would only powder coat bare metal.

I can see their point. However, they cannot powder coat inside the frame. Has anyone had their frame dipped and then powder coated? How did you protect inside the frame?

Thanks in advance. If I need to have bare metal I need to call the shop and make sure they don't prime the frame before I pick it up. If there is no way to protect inside the frame I'll probably just go with paint.

Whiplash

 

[Artsvette73]

Powder coat is applied to bare metal. I used a pressurized garden sprayer with " slight modification" to spray inside the frame with POR 15. I don't care for powder coat on frames for two reasons. One you can't get inside the rails. And two if the powder does get scratched and goes and goes unnoticed. The rust will travel underneith the powder coat and start to peal off.Jack

 

[Twin_Turbo]

Or have the frame zinc/flame sprayed (what is that process called in english?) and then have the pwodercoaters phoshate wash it (otherwise the powdercoat won't stick properly to the zinc plated surface) and then powdercoat it. it'll never rust again. However, if powdercoated properly the powder will be very hard to chip off.

 

[kiwi vet]

Or have the frame zinc/flame sprayed (what is that process called in english?) and then have the pwodercoaters phoshate wash it (otherwise the powdercoat won't stick properly to the zinc plated surface) and then powdercoat it. it'll never rust again. However, if powdercoated properly the powder will be very hard to chip off.

Hey Twin_Turbo
We call it galvanising, and your totally correct in the prep.
Only negative, it will add weight, but if you want it to last, this is it!

Grant

 

[paintdaddy]

You can do the galvanizing thing.Or you could epoxy prime and paint.Use the eastwood undercoat gun with the wand to get inside the frame rails.I never have liked powder coating for the same reason,bare metal needs a corrosion primer of some kind.If you were to powder coat you can also use some anti rust compound inside the frame rails after the powder coat is done.Its like a thick grease or wax.

 

[Whiplash]

You can do the galvanizing thing.Or you could epoxy prime and paint.Use the eastwood undercoat gun with the wand to get inside the frame rails.I never have liked powder coating for the same reason,bare metal needs a corrosion primer of some kind.If you were to powder coat you can also use some anti rust compound inside the frame rails after the powder coat is done.Its like a thick grease or wax.

Thanks everyone. I guess I'm going in the right direction now. The metal prep shop is going to spray the inside and outside of the frame with PPG 50 I think it's 50 maybe it's 90. The whole frame will be covered inside and out.

The next step will be to actually paint the frame. I'm either going to just do it with spray cans or go to a local body shop to have them spray there to avoid the mess.

The metal shop told me that the way they clean the frame and apply the PPG primer will last even better than the POR. They said that the process they use cleans the metal so well that they cannot get the primer off once they apply it. They say they are always able to get the POR off. Hard to say. Of course they have their whole marketing pitch.

I appreciate the feedback.

Whiplash

 

[Twin_Turbo]

Hey Twin_Turbo
We call it galvanising, and your totally correct in the prep.
Only negative, it will add weight, but if you want it to last, this is it!

Grant

galvanizing (named after Galvano is the application of a layer of zinc by dipping in a hot bath, the other processes are electroplating and the other one that I mean is what's probably called flame zinc spraying. The hot dipping introduces problems like cracking of the frame, any weld that isn't sound will crack because of the internal stresses in the frame being aggrevated by the hot temperature. And anyone that has seen the welding on these frames knows that these welds are very poorly done. The only way to properly do it is to weld the frame all the way beforehand, dip it and check for straightness afterwards and correct if needed.

The flame process uses either zinc or aluminium or a mixture of the 2. Aluminium is more expensive.

 

[kiwi vet]

galvanizing (named after Galvano is the application of a layer of zinc by dipping in a hot bath, the other processes are electroplating and the other one that I mean is what's probably called flame zinc spraying. The hot dipping introduces problems like cracking of the frame, any weld that isn't sound will crack because of the internal stresses in the frame being aggrevated by the hot temperature. And anyone that has seen the welding on these frames knows that these welds are very poorly done. The only way to properly do it is to weld the frame all the way beforehand, dip it and check for straightness afterwards and correct if needed.

The flame process uses either zinc or aluminium or a mixture of the 2. Aluminium is more expensive.

Hey TT
I stand corrected, thank you I didnt know that.
Grant