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Old 08-17-2006, 04:36 PM
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Painting aluminium

I may be posting this in the wrong place. If so I apologize before hand.

I wanted to know if anyone has had any luck\experiance painting aluminum? If so what do I need to look out for?

Thanks SC

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Old 08-17-2006, 06:34 PM
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Scuff it good so the paint has something to hold on to.

A 360 or 400 grit wet/dry paper should be good.

An epoxy primer may not be a bad idea either. So the primer will stock the aluminum better.
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Old 08-17-2006, 06:55 PM
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Thanks!

SC
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Old 08-18-2006, 06:56 AM
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I would go with 80-100 gt. Wipe down with a waterborne grease & wax remover,shoot epoxy on it as soon as you can cause aluminum will start to reoxidize as soon as it's dry, reforming it's "rust" if you will and the longer it sits,the less your chances of adhesion are. Some use an etch primer but for long term/best adhesion,I've found this method the best.
Painting aluminum is not as easy as most think. It will look good for awhile but after a few "hit's" and some flexing.it will start to lose adhesion.
Barry K gave me this advice awhile back and it's been a very viable procedure for long term adhesion.
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Old 08-18-2006, 05:59 PM
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I recently had to paint aluminum pieces at work. The way to do it is use phosphoric acid, then etch it. They sell aluminum prep kits that come with complete instructions. basically you dillute acid with water 1 to 2, spray it (cleans up aluminum really good) then rinse with water. After its dry apply etching (golden color) You wipe it before it dries and then rinse any residue. After its dry its ready for paint
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Old 10-25-2006, 06:35 PM
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Painting cast trans/rear housings

I want to paint the aluminum transmission housing and rear end housing the same "chevy orange" that the sbc motor will be painted. The trans/rear are from the Corvette C5 97-04 and are high quality fairly smooth castings with the rear having many fins and crevases. Sanding and physically prepping could only work maybe 70% on the trans and probably only 40-50% on the rear. Need recommendations of prepping with some type of liquid and also what primer to use.

Last edited by Justriken; 10-25-2006 at 07:50 PM.
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Old 10-25-2006, 07:34 PM
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You can usually get away with treating alluminum like most other metals when it comes to paint but if you want to go the extra mile alodyne before you prime. It etches into the aluminum and you will never have a corrosion problem if done right. Just be careful it's not healthy for you and let your brush air out before you dispose of it. It can get quite hot if you throw it in the trash wet. Zinc chromate primer works good too.
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Old 10-25-2006, 07:53 PM
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Quote:
Originally Posted by Justriken
I want to paint the aluminum transmission housing and rear end housing the same "chevy orange" that the sbc motor will be painted. The trans/rear are from the Corvette C5 97-04 and are high quality fairly smooth castings with the rear having many fins and crevases. Sanding and physically prepping could only work maybe 70% on the trans and probably only 40-50% on the rear. Need recommendations of prepping with some type of liquid and also what primer to use.
Actually using a dremel tool works well on that sortof thing..that and some patience..

Sam
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Old 10-25-2006, 08:13 PM
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Degrease,Sandblast,degrease, then epoxy prime. I've never seen an adhesion failure doing it this way.
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