high build primer

Anonymous-0 · Apr 1, 2013

I have a john deere pedal tractor that I have sandblasted and am getting ready to paint. I would like to have a glass like finish when I am done. The tractor is cast aluminum I believe. Should I epoxy prime then use a sandable high build primer or use the high build then prime or just paint? I have never used a high build primer just want to know what steps work the best. I even want to fill the seam of the the two havles of the tractor. What should I use? Thanks for the help.

RandyB(MI) · Apr 1, 2013

Yes, use the epoxy first then hi build 2 component urethane primer surfacer then block snd smooth. I wouldn't try to bridge the parting seam as it will ultimately crack in time from expansion/contraction and /or flexing plus would lower retail value if that will ever be a factor.

Stephen Newell · Apr 4, 2013

Epoxy primer isn't the best primer for aluminum. Some of them will tolerate it and some don't. Having sandblasted the metal will help with adhesion. Aluminum secretes an oil which interferes with adhesion. It's what turns your hands black from handling a aluminum ladder a lot. Anyway the benefit of the epoxy primer is rust prevention which isn't needed on aluminum. There are primers formulated for aluminum such as Dupont Variprime. I would feel more comfortable using that. Then you could use a filler primer such as Featherfil over the top for sanding and leveling. I don't believe I would fill the seams. Depending on how it's made there may be some movement in the two sections which would make the filler crack. Anyway if it is minor you can use a glaze filler or bondo.

glennster · Apr 4, 2013

wash with hot soapy water, blow dry with an air gun. scuff sand with some 180 to give the primer a good bite surface. next, wax and grease remover, then hit it with either quick prep or 501. prime with RM DP series powerfill 2k primer, either dp 25,26,or 27. no need for any other primers. the dp series can be sanded as it is surfacer also. click on the link to see some of the stuff we've done
poke here

GordoSD · Apr 5, 2013

I know all th aircraft builders and rebuilders use a primer called zinc chromate on aluminum ac skins.

kylemorley · Apr 5, 2013

In aircraft usage (and high end motorcycle restoration) the bare metal is usually etched with a acid treatment like Alumnaprep33, then a conversion coating like Alodine.

This leaves a corrosion resistant coating the is ready for whatever paint you please.

Painting aluminum is always tricky because the bare aluminum developes an oxide coating almost immediately, that isn't a good base for paint. A conversion coating like Alodine leaves a microscopic layer of chromate, chemically similar to anodizing, which is.

showcrop · Apr 5, 2013

(quoted from post at 17:25:29 04/05/13) In aircraft usage (and high end motorcycle restoration) the bare metal is usually etched with a acid treatment like Alumnaprep33, then a conversion coating like Alodine.

This leaves a corrosion resistant coating the is ready for whatever paint you please.

Painting aluminum is always tricky because the bare aluminum developes an oxide coating almost immediately, that isn't a good base for paint. A conversion coating like Alodine leaves a microscopic layer of chromate, chemically similar to anodizing, which is.

The oxide will come off on your fingers black and will feel almost oily.

high build primer

Anonymous-0

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RandyB(MI)

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Stephen Newell

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glennster

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GordoSD

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kylemorley

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showcrop

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