Re: [PSUBS-MAILIST] Paint on Galv.

["kocpnt tds.net" <kocpnt@tds.net>]

Hi Frank,

 

I was refering to galvanized steel only. Most good coating systems use a zinc rich primer as a first coat followed by high build epoxy.

 

I did not mean to imply that this was inappropriate, as a matter of fact it is the exact system I am using.

 

My first coat after sandblasting was Sherwin-Williams Corothane I Galvapac two pack zinc primer. This is a moisture cure urethane

                                                    system that requires the mixing in nof the zinc dust. Nasty side effects - Air supplied respirator

                                                    is needed. They also have many other zinc primers available.

 

                            

My next two coats were                  Sherwin - Williams Macropoxy 646 a high solids two component epoxy.

 

Hope this helps. Sorry about any confusion I caused.

 

 

Best Regards,

 

Jim K

On Fri, Sep 11, 2009 at 10:41 AM, <ShellyDalg@aol.com> wrote:

Hi Jim. I've seen hot dipped assemblies painted on jobs I worked on. The most recent was two sets of stairs at a local college. Big, about 30 feet long and shipped out completely welded and  hot dipped.

 After installation they were sanded a little to smooth out the galvy coating and spray painted. I assume it was an enamel. It smelled like a solvent based paint, maybe like "Rustoleum" or something.

Is there a paint that CAN be applied over a zinc coating that won't de-bond ?

The only time I've done it myself was painting lettering on the Zincalate paint mentioned before and like I said, after a year or so the lettering faded out. This is on the roof and it gets hot, cold, and weathered. Not submerged.

Frank D.