Powdering over galvanized items

[trsick]

Hi All:
I always sandblast off the galvanized finish before I PC it. But do you really have to? I just got in a 56 piece order & would love to be able to pc over without removing the galvy finish?
Any BTDT advise
Thanks
Bob

[tavo1765]

by a chemical process or heat process, I just shoot them with Tiger Drylacs outgass forgiving black as a primer, also shoot them hot.

[Blademan]

i've done alot of galv and done nothing more than just clean the surface with acetone..

[trsick]

Thanks Guy's:
I should have mentioned.. these items are going to be deployed in the ocean for 6 months or more. Have any of you seen the items you have done (with out removing the galvy coat) after they hqave been out in the elements?
I plan to shoot them with a "zinc rich primer" first, then only cure the primer for a couple of minutes, remove & reshoot them "hot" with the color powder. What do you think?
Thanks
Bob

[Blademan]

Bob all the stuff that i do is in house cast alum and stainless steel ,havent done anything in galv that went out on a ship, mostly stuff for myself and it seems to hold up pretty good here on the coast. Bob heres a link to the place I powder coat for...http://freemanmarine.com/ ....seeings how we both seem to have marine companys we do buisness with maybe we should hook up and share notes..talk at ya laterzzz.

i shoot right over it .. no problems at all

[trsick]

Thaks Guy's:
I ended up media blasting the items first, them zinc rich primier & safety yellow over.
Much more work but this is a BIG customer & lot's more work from them done the road. I want it to last, as all thier items are deployed at sea for long periods of time.
Thanks
Bob

[trsick]

Hey Blademan:
Yes we should talk. I do a ton of marine stuff. My location is right on the water North East coast.
Later
Bob

[kchotboat]

A friend of mine has been powder coating galvanized parts for boat docks and lifts for a couple of years now that get shipped to slat water areas.

trsick marine parts is all I do since this is just a side thing for me and I am into boats.