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DTM Bonding Primer by Sherwin Williams - presence of zincApproveRejectUn-ApproveSubscribeUn-Unsubscribe

Question asked 2021-02-23 21:41:29 ... Most recent comment 2021-02-23 21:32:00
Art Conservation Topics Grounds / Priming

In your reference materials on Grounds and Primers you are very clear about the need to avoid zinc: "zinc white has been found to react with components in oils and alkyds and form “metal soaps,” which in turn can give rise to delamination, wrinkling, the formation of white-colored aggregates, and the softening of ground/paint layers." 

On several places on this site you recommend DTM Bonding Primer by Sherwin Williams, particularly for ACM. 

The EDS data sheet suggests it contains zinc:

Zinc (as Zn)             2% by weight

Zinc Compound      3% by weight.

https://www.paintdocs.com/docs/webPDF.jsp?SITEID=SWPCGPROT&doctype=EDS&prodno=035777281734&lang=2

I'm not a chemist but a group of us at Wetcanvas forum are seeking clarification. Is this zinc in a different form that doesn't create problems? If so what forms of zinc do not need to be avoided? Have I misinterpreted the EDS?

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