Cold Galvanising... Any good paints still available out there?
Cold Galvanising... Any good paints still available out there?
(OP)
Hello All,
I've asked for Hot Dip Galv on a project, and the Contractor has asked if there are any paint options. I pointed out that I would only approve an alternative with the Owner's consent, but it seems that my old go-to products are no longer on the market.
Does anyone know of a good alternative to W.R.Meadows Galvafroid and Sherwin-Williams Zinc Clad 7? I'm told the new stuff is a mix of zinc and epoxy, but I just don't know if I'd trust that... The Sherwin rep told me of one of his suggestions "it is rated for a full year in contact with moist concrete.
I'm looking to embed the plate in grout/concrete/parging.
Thanks!
I've asked for Hot Dip Galv on a project, and the Contractor has asked if there are any paint options. I pointed out that I would only approve an alternative with the Owner's consent, but it seems that my old go-to products are no longer on the market.
Does anyone know of a good alternative to W.R.Meadows Galvafroid and Sherwin-Williams Zinc Clad 7? I'm told the new stuff is a mix of zinc and epoxy, but I just don't know if I'd trust that... The Sherwin rep told me of one of his suggestions "it is rated for a full year in contact with moist concrete.
I'm looking to embed the plate in grout/concrete/parging.
Thanks!






RE: Cold Galvanising... Any good paints still available out there?
http://www.zrcworldwide.com/
RE: Cold Galvanising... Any good paints still available out there?
Looks like that's a great replacement to the paints I can no longer locate, only it has an added caution the others didn't which is going to be a problem for this particular job: "NOT RECOMMENDED FOR: Contact with potable water, strong acids or strong alkalis"
Concrete and grouts are strongly alkalyne when wet... I suppose I can always check with the manufacturer as to whether or not this is a problem.
Thanks!
RE: Cold Galvanising... Any good paints still available out there?
If you want to go with ZRC, look into covering it with an epoxy or other suitable coating to protect it from its environment. As in all coatings, the surface prep is the most important part of the process.
Michael.
"Science adjusts its views based on what's observed. Faith is the denial of observation so that belief can be preserved." ~ Tim Minchin
RE: Cold Galvanising... Any good paints still available out there?
If you do go to a high performance coating other than HDG, inorganic zinc on a white metal blasted surface, followed by epoxy or urethane topcoats, is the usual regimen.
RE: Cold Galvanising... Any good paints still available out there?
Dik
RE: Cold Galvanising... Any good paints still available out there?
Read case studies for comparisons on ZRC WOrldwide
Thanks,
FEM4Structures
RE: Cold Galvanising... Any good paints still available out there?
RE: Cold Galvanising... Any good paints still available out there?
RE: Cold Galvanising... Any good paints still available out there?
If your plate is fully embedded in concrete, I wouldn't worry about a coating. If partially embedded in concrete, failure at the interface is inevitable....just a matter of time depending on HDG or coating.
RE: Cold Galvanising... Any good paints still available out there?
RE: Cold Galvanising... Any good paints still available out there?
“Faith is taking the first step even when you don’t see the whole staircase.” MLK
RE: Cold Galvanising... Any good paints still available out there?
Well aware that HDG is the best choice. With the owner not wanting the expense, I would been a techical or code based (read: defensible) position to refuse.
RE: Cold Galvanising... Any good paints still available out there?
THE FOLLOWING COATING SYSTEMS SHALL BE USED:
SYSTEM 04: FAYING SURFACES (EPOXY TOPCOAT):
BASE METAL - STEEL
CLEANING - TO SSPC-SP 1 AND SSPC-SP 10
PRIMER - DEVOE 'CATHACOAT 302HB - REINF INORGANIC ZINC PRIMER'
SYSTEM 05: HOT DIPPED GALVANISING
BASE METAL - STEEL
CLEANING - TO SSPC-SP 1 AND SSPC-SP 10
HDG - TO ASTM A123, THICKNESS TO Z275
SYSTEM 09: EPOXY WITH ZINC RICH PRIMER
BASE METAL - STEEL
CLEANING - TO SSPC-SP 1 AND SSPC-SP 10
PRIMER - DEVOE 'CATHACOAT 302HB - REINF INORGANIC ZINC PRIMER
TOPCOAT - DEVOE 'BARRUST 235 - MULTIPURPOSE EPOXY COATING'
SYSTEM 10: EPOXY COATING OVER HDG
BASE METAL - HDG STEEL
CLEANING - TO SSPC-SP 1
WASH - POLYCLUTCH 97-687 BY PPG OR APPD EQ
PRIMER - AMERLOCK 400 TWO COMPONENT EPOXY BY PPG OR APPD EQ
TOPCOAT - AMERCOAT 450H TWO COMPONENT ALIPHATIC POLYURETHANE TOPCOAT BY PPG
SYSTEM 11: EPOXY COATING OVER HDG (ALTERNATIVE)
BASE METAL - HDG STEEL
CLEANING - TO SSPC-SP 1
PRIMER - DEVOE DEVRAN 201 EPOXY
TOPCOAT - DEVOE DEVTHANE 379 URETHANE
SYSTEM 12: THREE PART EPOXY COATING OVER HDG
BASE METAL - HDG STEEL
CLEANING - TO SSPC-SP 1
PRIMER - DEVOE DEVRAN 201 EPOXY
SUBCOAT - DEVOE 'BARRUST 235 - MULTIPURPOSE EPOXY COATING'
TOPCOAT - DEVOE 'DEVTHANE 379H - ALIPHATIC URETHANE GLOSS ENAMEL'
SYSTEM 23: POLYURETHANE COATING OVER HDG
BASE METAL - HDG STEEL
CLEANING - TO SSPC-SP 1
PRIMER - DEVOE DEVRAN 201H (POLYAMIDE EPOXY)
TOPCOAT - DEVOE DEVTHANE 379H (ALIPHATIC POLYURETHANE)
Dik
RE: Cold Galvanising... Any good paints still available out there?
RE: Cold Galvanising... Any good paints still available out there?
BA
RE: Cold Galvanising... Any good paints still available out there?
Hot dip galvanizing
Sealed thermal spray
Inorganic zinc coating**
2=part/3-part Epoxy zinc coating***
Good one-component "cold galv" products
Cheap one-component products
*Presuming similar thickness, a quality product and proper application.
** With high time-of-wetness, high-ratio IOZ (like the original NASA formulation) can vault to the top of the list. Specific formulation matters, though.