The Murphy Builders Site

What Zinc Chromate Epoxy Primer alternatives would you recommend? I haven't been able to track down any Zinc Chromate Epoxy Primer down under. I've found a few self etch primers that are supposed to be good for aluminum but are these appropriate? What do you suggest?

Thanks
Philip

TongueTied wrote:What Zinc Chromate Epoxy Primer alternatives would you recommend? I haven't been able to track down any Zinc Chromate Epoxy Primer down under. I've found a few self etch primers that are supposed to be good for aluminum but are these appropriate? What do you suggest?

Thanks
Philip

Not sure if it can be had in Oz but we use Dupont Corlar self etching primer available from autobody material jobbers. I called the Dupont tech line & asked and this was their recommendation.

Dave
Elite583

G'day Dave, Phil and others .....

Ok - I used aerosol cans of Zinc Oxide - rather than Zinc Chromate
( Zinc Oxide is no where near as dangerous / carcenogenic as the chromate - so I have been told )

Zinc Oxide is available from many outlets in Oz .... "A.P.E." at Bankstown Airport carries it
Aircraft Spruce carries it etc ...

I only used it between overlapping skins - mainly to protect against
Any water electrolysis that may occur ....
Don't forget - the Rebel is made with 6061T6 - which is "exterior grade" ( and "structural grade" as well ) - aluminium !

IE : it's NOT like 2024T3 - which HAS to be treated with something ALL OVER - due to its crappy
Corrosion properties !

Unless you are puting your Rebel on floats & SALT water - you don't need "all over protection" !!!

Hope this helps !

Rick in Orstraylya ....
D'oH !

G'Day Dave, I am using BMS 10/11, a Boeing spec epoxy primer between all the faying surfaces and assembling while wet, including dipping the rivets.
Just hope hope that I never have to take anything apart. It is available from PPG in Tullamarine, or if you have a friendly airline LAME, a bit cheaper.
(they are fussy about shelf life.) PS just don't get it where you may want to paint later.
John
Rebel 804 down under.

Thanks everyone. I took the plunge and bought some EP420/430 from Aviaquip. I'll use that between mating surfaces at least. Being near the coast, I will probably do a light dusting of self etch primer on the inside surfaces.
Cheers,
Philip