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Primer for aluminium hood

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Vincesmgc Avatar
Vincesmgc Vince Warry
West vancouver, BC, Canada   CAN
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1969 MG MGC
To make a very loooong story short, I am working on putting a louvered good on the c. I originally used southern polyurethanes epoxy primer on my other hood and it stuck like glue. I think after sitting a few years it's lost it's chemical effectiveness because I sprayed my louvers good with it yesterday, and just watched in amazed as I used an air gun to blow most of it off sad smiley

So... Since I need to buy some, are there any recommendations for a base primer (epoxy?) that will stick to the aluminium better? Did anyone just use regular epoxy primer?

Thanks
Vince


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ga duke Avatar
ga duke Mike Dooley
Newnan, GA, USA   USA
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Vince:

If I remember correctly, you will need to use an etching primer on aluminum...without further research, can't add more at this time.

Other's perhaps?

M

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Jimenez Avatar
Jimenez James Elliott
BellsHill, Scotland, UK   GBR
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1968 MG MGC
1968 MG MGC
Hi Vince
you will need to use an etch primer,then you can apply your normal primer on top ,taking care not to rub through the etch then you can apply your top coat of paint,hope this is of use .
Regards Jim

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triplec Avatar
triplec Russell Williams
Neskowin, OR, USA   USA
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1966 MG MGB "Bridget"
My painter used a primer I researched for use on bare aluminum, Transtar DTM 7344 primer with Transtar 7357 activator on bare Aluminum hood. I shot Acrylic enamel (Delstar ) over it. It worked great and still looks good.

Russ

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Vincesmgc Avatar
Vincesmgc Vince Warry
West vancouver, BC, Canada   CAN
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1969 MG MGC
Thanks guys... So this hood needs some body work love... My usual steps are:

Rough up metal and shoot epoxy primer. Apply all metal filler to big dents.... Get things smoothed out roughly, then shoot spray polyester filler over the whole thing. Sand flat, cover in 1 coat epoxy,a few coats of 2k, and then go from there with 400 to 600 grit.

Not sure what to do after spraying the etch down..... As I say... This hood needs lots of body love

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9146 Avatar
9146 rick dentel
yardley, PA, USA   USA
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Did my friends 280SL after media blasting with Glausurit acid etching primer. The body shop used Glausurit epoxy primer and 2 stage on top, looks great.(hood,doors and trunk lid are AL)

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kirks-auto Robert Kirk (RIP)
Davenport, IA, USA   USA
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Primer etch is a little known secret to base prep for anything and especially alloy. I endorse those who say so above. thumbs up



Regards,
Robert Kirk

kirkbrit@yahoo.com
E-mail PLEASE for quote/questions/orders

Business phone 563 323 1017

http://kirks-auto.com/
Moss distributor/UK importer
Beat or match most retail/delivered quote

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Jimenez Avatar
Jimenez James Elliott
BellsHill, Scotland, UK   GBR
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1968 MG MGC
1968 MG MGC
Hi Vince
just take your time and you can get a nice finish
Regards Jim


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Vincesmgc Avatar
Vincesmgc Vince Warry
West vancouver, BC, Canada   CAN
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1969 MG MGC
Thanks Jim, but despite numerous trips to the local body shops, I still haven't discovered a etch primer that is happily compatible with 2k primers and such. :/ if anyone has a ppg number that would be preferable.

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Jimenez Avatar
Jimenez James Elliott
BellsHill, Scotland, UK   GBR
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1968 MG MGC
1968 MG MGC
Hi Vince will check for you tommorrow
Regards Jim

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MG four six eight Bill Jacobson
WA, USA   USA
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Vince,

Be careful when using all-metal on somewhat flexible panels such as an aluminum hood. It requires a really rough surface such as scuffing with 16 grit sand paper, otherwise it can loose adhesion with the base metal due to heat flexing from the engine temps.
I've found that fiberglass re-enforced filler usually works better as it can flex with the thermal expansion that a hood goes though.

Bill

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kirks-auto Robert Kirk (RIP)
Davenport, IA, USA   USA
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My advice is to go to the paint suppliers. In the end it is their responsibility to provide correct materials. Shops/painters just have their personal bias for one thing or another. They get good with one company's brand and prefer not to stray...at least that is my read about many if not most.



Regards,
Robert Kirk

kirkbrit@yahoo.com
E-mail PLEASE for quote/questions/orders

Business phone 563 323 1017

http://kirks-auto.com/
Moss distributor/UK importer
Beat or match most retail/delivered quote



Edited 1 time(s). Last edit at 2014-08-01 08:40 AM by kirks-auto.

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emgeec69 Avatar
emgeec69 Gold Member Carroll Phillips
middletown, NY, USA   USA
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Vince,

See PPG product data sheet P-226

If you have a clean paint stripped hood ( i.e. not media blasted , I hope ) you do NOT need a wash primer ( i.e. acid etch primer)
If hood has been blasted or heavily sanded use an acid etch primer

Aluminum is known for having lots of corrosion on its surface ( depending on how long its exposed) Try TIG welding on a dirty alum surface and you will find out. Steel panels require a similar treatment also ( cleaning and conditioning) prior to surface coating

For clean original surface ... first clean with PPG DX 533 . then you need PPG DX 503 ( for a surface being painted) it is a chromic acid based chemical that becomes part of the alum surface that promotes adhesion .

DX 503 will turn the surface a tan color

DX 501 is a clear version for keeping alum its '' White metal'' appearance when a bare alum panel is desired

Follow instructions and you can use the DPLF epoxy based primers over the treated alum surface , then after drying time you can use your body filler over that and continue the body process.

Ive done many Austin Healey 3000s ( alum front and rear shrouds) with this process .

Not a fan of Acid etch primers

Carroll Phillips
Top Down Restorations

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Airman49 Avatar
Airman49 Gunnar Nyhus
Frosta, Nord-Trøndelag, Norway   NOR
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Or you could try Aircraft Spruce:
Aircraft Spruce Etch Primer

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