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Old 29 June 2015, 08:01   #1
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Re-painting a prop

I have a good aluminium prop but the paint is flaking off ( I think the person I bought it off had re-sprayed in poorly with no primer?)

Can anyone recommend good primer and top coat for spraying an aluminium prop? Colour not important.

Can I use the two listed below? Or is there something better?

1 X AUTOTEK PROFESSIONAL ACID ETCH PRIMER AEROSOL 500ML FOR GALVANISED ALUMINIUM | eBay

Simoniz Tough Black Satin 500ml Car Spray Paint Aerosol Can | eBay
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Old 29 June 2015, 08:58   #2
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Best method:
Remove the old paint with paint stripper
Wipe the aluminum down with acetone to degrease.
Wipe the aluminum down with household vinegar to degrease / lightly acid etch (wait for it to evaporate completely)
Spray with etching primer to etch / prime
Spray with paint
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Old 29 June 2015, 09:49   #3
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Fully agree on the pro procedure however...

I rubbed mine down with wet and dry leaving the sound original paint just removing the "bubbles" and other defects down to alloy. Then I did a couple of dust coats with black gloss spray topcoat from Halfords to give a light coating to the exposed alloy. Then three more coats all over with the black gloss to a nice finish.

In theory the gloss shouldn't hold straight onto alloy but it did... with one prop for 3yrs and another 1yr until I sold the outboard.

Perhaps these lasted well as they were occasional leisure use boats and low hp outboards.
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Old 29 June 2015, 10:48   #4
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Strip, key with 600 paper, degrease with acetone, a coat of acid etch, hit with 2/3 coats of colour, only allow to tack off slightly between coat. :-)
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Old 29 June 2015, 11:01   #5
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Thanks but can anyone actually recommend any decent paints they have used before?
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Old 29 June 2015, 13:56   #6
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RIBase
Halfords black enamel gloss. Same preparation as mentioned. Did my other propeller which is showing some wear now. Reckon you'll get a couple of years out of the finish before having to repaint.

I also stuck it in the oven at 50 degrees for 20 minutes. Don't do it at high temperatures or for longer or you'll risk damaging the rubber hub.
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Old 29 June 2015, 15:11   #7
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Best not to do it with the wife around either!
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Old 29 June 2015, 15:27   #8
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upol acid 8 2 light dust coats then any solvent based rattle can black mat satin or gloss its up to you .tbh if you have never done this before do satin 3 light coats from about 6-8 inches build up slowly. let it go just touch dry between coats
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Old 29 June 2015, 15:45   #9
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^^^^U-Pol Acid8 is very good. I use it on cars as & when required.
Available from Halford's etc as a rattle can.
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Old 29 June 2015, 15:57   #10
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The autotek stuff you mentioned is ok. I used it on land rover panels years ago and it seems to have weathered well. I was going to say I used it on my prop but now I think about it that was some two pack yellow wash primer which is probably better.
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