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June 26 - June 30, 2017

How do you repair delaminated areas of an elastomeric polyurea when the majority of the coating system is intact?

Selected Answers

From William McLaughlin of Sponge-Jet Inc. on June 30, 2017:
Using a recyclable encapsulated media, consistent with SSPC- AB 4, will effectively remove such abrasion-resistant coatings while producing the surface cleanliness, profile depth and feathered edges necessary to support a quality repair.

My experience with polyurea repair in small sections when  most of the coating is in good conditions is to cut the area; clean  the substrate perfectly, eliminating the dust, rust, salt, etc.; sand perfectly the borders of the existing coating to make a type of "beach shore" and wet with isopropyl alcohol; let the alcohol evaporate and apply a "brush" type polyurea or the same sprayable polyurea on the prepared area. It works perfectly on thickeners in the mining industry, flotation cells, flooring in parking garages and industrial zones.

From Juan I. Ordinas of LOTUM, SA on June 26, 2017:
The basis of the solution is similar to dealing with other types of coatings with small localized problems. First of all, you need to remove all polyurea with adherence problems down to a sound substrate, ideally metal or concrete. Prepare and prime it. Now you have to apply a new material in these areas. Typically, you will not apply a hot-spray polyurea for small areas, so you will apply a cold polyurea or a polyurethane with similar elongation. To ensure the adherence between the repaired areas and the original coating, the repair material must overlap the original coating that must be abraded to ensure adherence.

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Tagged categories: Coating Application; Coating failure; Delamination; Polyurea

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