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Standards Used for Partial Coating Removal During Maintenance Painting

From JPCL, July 2017

More items for Surface Preparation

By J. Peter Ault, P.E., PCS and Eric Shoyer, Elzly Technology Corporation

Partial surface preparation is a cost-saving concept with merit and demonstrated success in low-risk applications. This article details the challenges one must overcome prior to adopting partial surface preparation for high-risk applications with long desired service life....

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Tagged categories: Certifications and standards; J. Peter Ault; NACE; Paint and coatings removal; SSPC

Comment from Gunnar Ackx, (7/25/2017, 7:21 AM)

Interesting article as I was trying to specify a job where only 'grinding dust contamination' (aka swarf) needs to be removed from a PU-topcoat (trying to figure out what standard would be best for that). However, could it be in this article that some standards references got mixed up? References #9 & 10 (SP6-WAB & SP7-WAB) as far as I know are Wet Abrasive Blast standards. And NOT Waterjetting standards... Would be interested to hear what standard one would reference for the 'swarf-removal' (i.e. tightly adherent metallic grinding dust which attached itself to a PU topcoat)? Thank you.

Comment from Warren Brand, (7/26/2017, 8:09 AM)

I understand the intent of standards. They try to codify the experience of senior and seasoned coating professionals to ensure uniform applications when they are not on hand on a specific project. We are often called upon to identify optimal solutions to various situations. And as the article states in the beginning, often complete removal is specified. The reasons for this are too complex for this comment. However, I've found it's nearly impossible to follow or specify a standard for touchup work or partial abrasive blasting or brush-blasting and recoat, without a died-in-the-wool seasoned coating "inspector" onsite. I write inspector in quotes, as when we send out an inspector, it is often in the mode of a collaborative relationship with the contractor, working together for the best interest of the client.

Comment from Lydia Frenzel, (7/27/2017, 7:54 PM)

Yes- When I read the article- I applauded the authors for recognizing Wj and WAB, but then the references were incorrect. When we initiated the WJ standards, the committee started by keeping "what is good" on the substrate and removing "what is bad." Over the years, we have just trended towards the more established Abrasive blasting text. The older abrasive text leads to confusion where you are trying to go to an intermediate coat, or stress the system to determine where the weak spot are. One of the more successful coatings companies to do this is TermaRust in Canada, where essentially WJ-4 is their surface preparation.It takes a skilled contractor, a skilled inspector, and a skilled coatings manufacturer.

Comment from Pete Ault, (8/7/2017, 10:34 AM)

Apologies for the error in the water-jetting reference, the original text referenced SP-12 and when I suggested the last-minute article update I provided the wrong reference. I believe the same concepts apply for WJ and WAB procedures - nothing technically wrong with "partial" removal, it's just hard to inspect. You have to be willing to put more faith in the person holding the nozzle/jet...that is sometimes hard for inspectors and owners to do.

Comment from Lee Wilson, (8/17/2017, 2:15 PM)

Can someone explain the correlation between the WJ standards and the attempts to amalgamate the dry abrasive blasting standards and the water jetting standards?

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