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Sunrez Corp. (El Cajon, Calif., U.S.) is featuring its custom 7355 VOC-free products for ultraviolet (UV) cure. These products include prepregs, putties and primer. When used in combination, they can effectively repair and bond composite and metal structures in minutes instead of hours, the company reports.

Sunrez’s 7355-vinyl ester prepregs offer single-component pre-impregnated fiberglass fabrics with long-term shelf stability and working time, as well as rapid cure without any requirement for post-cure. Standard fabrics include 1,000 gsm UD, 900 gsm Combi and 800 gsm Biax, as well as chopped strand mat and surf cloths. According to the company, these prepregs are ideal for field repairs where enhanced strength and corrosion resistance are desired.

The Sunrez 1022 primer can provide optimal adhesion to aluminum, steel, ABS, PVC and any composite surface with minimal surface preparation. No VOCs or HAPs are present, so no emissions are created.

All Sunrez products are one-component, so no mixing or wetout is required on-site. No shipment of flammable resins or peroxides are required, as well. Moreover, no special storage requirements are needed because working time is measured in days if the materials are kept out of sunlight. Cure times, either by sunlight or by Sunrez’s UV lights, are said to take less than 10 minutes and are insensitive to temperature changes. No post-cure is needed to achieve a complete cure, according to the company, and its vinyl ester backbone provides enhanced mechanical and thermal properties, as well as optimal chemical resistance and flame spread performance.

These fabrics and mats are available in various customizable sizes, from a few inches up to a full meter in width.