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September 27 - October 3, 2015

How long after blasting can stainless steel be left before painting? If this time is exceeded, what further surface preparation is required?


Selected Answers

From Rahil Shaikh of Link Middle East LLC on September 7, 2017:
Within 4 hours after blasting, the surface must be primed to avoid oxidation. If this time is exceeded, then sweep blasting must be done.

From Juarez Machado of Akzo Nobel on October 2, 2015:
It will depend on the abrasive type, weather condition and air quality. The abrasive shall be free of metals, and the weather condition shall meet the product data sheet recommendation. If the atmosphere is highly chemically polluted and/or contains salt spray, the surface shall be fresh-water washed prior to coating application.

From Warren Brand of Chicago Coatings Group on October 1, 2015:
We've coated hundreds of thousands of square feet of stainless steel swimming pools and various types of tanks. We treat stainless steel exactly the same way we treat carbon steel. Blasting will damage the corrosion-resistant surface of the stainless and, depending on the aggregate used, the aggregate may have small amounts of iron in it, which can become imbedded into the blast profile of the stainless steel.

From Antonio Leal of IMMT-Institut MacaƩ Tecnology and Metrology on September 29, 2015:
WHY PAINT SS, AS EVERYBODY KNOWS IT IS RESISTANT TO CORROSION? AND IF YOU PAINT, WHY BLAST IT? IT IS ENOUGH TO CLEAN IT AND IF THE WEATHER CONDITIONS ALLOW, APPLY A WASH PRIMER BEFORE THE TOPCOAT.

From OM PRAKASH JAT of TECH INTERNATIONAL SHARJAH HAMRIAH UAE. on September 28, 2015:
Paint application should be started within 4 hours as recommended, and its depends on weather conditions, too.  If humidity is high, then the surface will get black layer because of reaction with its environment. Blasted surface should not be left overnight. Either reblast or sweep blast if necessary before paint application. If the surface is not deteriorated, you can keep it in a controlled environment more than a year. During the inspection, it has to meet all the specified parameters . If you get clearance from client, within 15 minutes you can apply the coating,  and if you did not get the clearance within the specified time, i think it is 4 hours. Then you have to go for re- blasting or sweep blasting.

From Giuseppe Santagata of NACE Certif. Coat. Insp. level III # 2737 on September 24, 2015:
From my point of view, there is no problem to leave SS uncoated after abrasive blasting cleaning (if a proper abrasive media has been used), depending on where the surfaces are stored. However, I think that a good cleaning as per SSPC-1 using suitable cleaning solutions/compounds will be sufficient, before applying a proper coating system.

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Tagged categories: Asia Pacific; Bill Shoup; EMEA (Europe, Middle East and Africa); Latin America; North America; Stainless steel; Surface Preparation; Surface preparation


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