Hot Dipped Galvanized Prep - blast or acid wash - Contractor Talk - Professional Construction and Remodeling Forum

NAV · 07-01-2009, 11:36 AM

I have to bid a job to brush blast and paint a galvanized light pole - 100 feet high (its on the ground now)

Anyone know if an acid wash is sufficient prep for hot dipped galvanized or do i have to brush blast?

materials are Macropoxy primer and Acrolon 218hs top coat.

I have painted galvanized before but never new hot dipped galvanized.

vandyandsons · 07-01-2009, 04:56 PM

Hey NAV,

It's been while, but I have used a product designed to prime galvanized metals without blasting at all.

It's called GalvaGrip, and it's made by Madison Chemical.

It boasts of not needing to blast.

Check it out.

NAV · 07-02-2009, 07:11 AM

I can not change the spec.

I am going to go with Clean and Etch to prep the pole. I looked at the job yesterday and got the contract this morning. We are heading out in about an hour.

I hope the acid wash preps it good enough because it will kick my a** to have to touch it up after they put it up.

I will look into that product for future application needs, thanks

gideond · 07-03-2009, 05:56 AM

Blasting is best but a phosphoric acid wash should do the trick. We usually use a product called Ospho.