Debasis Are you sure weld- through- primers used / recommended for use contain 92% metallic zinc (for use on welds before welding). Weld -through- primers are normally given for surface portection before welding - mostly organic based or alkyd based. I am not sure if any one specifically recommends use of weld- through- primers containing metallic zinc rich inorganic paint (92% metallic zinc primer). If such zinc rich inorganic primers are recommended / used, the weld will be susceptible for cracking due to embrittlement. I doubt if weld-throgh -primers contain contain metallic zinc. I have not come across specification of such use. However, i suggest that you can check with paint manufacturers on their product formulation and product specification ( to be sure) if zinc rich weld-through-primers are in use. C.V.Srinivasan Nishi Engineers Pvt Ltd India August 21,2005 E-mail: nishi@vsnl.com >I have some contradiction here... >For a galvanized item, to avoid Zinc Penetration Cracking & >Embrittlement problems in welds , weld edge and adjacent >portions are removed ( skinned out ) from galvanizing by >burning & dressing the Zinc out. But the concept of >"Weld-through Primers" where these zinc rich primers are >applied at the weld areas prior to welding are contradicting >the former one. >Please discuss this issue to make it clear. regards