paint spec 1

[oneintheeye]

what is the best type of paint for use outside in an area close to the coast?

 

[hokie66]

Best coating--hot dipped galvanizing

Next best--inorganic zinc over white metal

 

[RockEngineer]

You asked the $64,000,000 question. I have to evaluate coating proposed for US Navy equipment all the time and I found this table a few years ago that I just love. It rates paint coatings on steel based on the surface preparation, environment and service life. I use it to specify performance with statements like: "Coatings shall have a minimum expected life of 15 years in a Seacoast Marine Heavy Industrial envioronment when rated per NACE paper No. 477 or similar nationally recognized rating system". This reference is a more concise table printed by a paint manufacturer. I have printed out the actual report but I couldn't find the web reference right off. It is from the 1996 Inernational Corrosion Conference.

http://ppgamercoatus.ppgpmc.com/psxTechnology/pdf/NACE_477A.pdf

 

[hokie66]

Interesting table, RockEngineer. Intriguing that no ratings are shown for galvanising, either as a stand alone coat or as the first of a system. Since it was produced by a paint manufacturer, I guess that explains it.

 

[hokie66]

In a marine environment, that is.

 

[RockEngineer]

Here is the original paper 477 by NACE.

http://web.nace.org/Departments/Store/product.aspx?id=cb505e65-bce7-40b2-b5da-5f9e98727e15