Everything I have heard says not to coat over galvanization. When doing engine heat shields that are galvanized I have been blasting all the zinc off, a slow process at best. If I just do a good sandblast is that enough, or do I really need to remove all the zinc?
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Coating galvinized parts
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Re: Coating galvinized parts
Originally posted by ElectrathonEverything I have heard says not to coat over galvanization. When doing engine heat shields that are galvanized I have been blasting all the zinc off, a slow process at best. If I just do a good sandblast is that enough, or do I really need to remove all the zinc?if so look in the album as I have done 3 sets of air tubes and upper shields, along with the V6 cross over shields. I just blasted them.
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Re: Coating galvinized parts
Originally posted by Noob2PCAre you talking out the Fiero Heat shieldsif so look in the album as I have done 3 sets of air tubes and upper shields, along with the V6 cross over shields. I just blasted them.
The air tubes are very easy, they are aluminum. This is the various galvanized heat shields that are slowing me down.
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An easy way to remove zinc plate is to immerse the part in a 10% solution of muriatic acid. The zinc will go black when it is dissolved. Then a light bead blast will remove the oxide.
You should rinse in fresh water to remove the acid prior to blasting.--
Mike Caswell
Caswell Inc
http://www.caswellplating.com
Need Support? Visit our online support section at http://support.caswellplating.com
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Just looked at the ones you have posted in the album, I am doing the same ones. Yours look very good, but if you went over the zinc you will not have good long term durability. As I understand it, zinc is about like coating over painted or rusted metal. It may sort of stick, but nothing by comparison with the extreme durability we expect from powder coat.
Caswell: Thank you! That is exactly what I was looking for.
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Originally posted by ElectrathonJust looked at the ones you have posted in the album, I am doing the same ones. Yours look very good, but if you went over the zinc you will not have good long term durability.
Caswell: Thank you! That is exactly what I was looking for.
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