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After Roeder grinds out the gelcoat from the seam using a die grinder with a cutting bit, the 3M HSRF is mixed according to instructions and applied to the body seams to fill the ground areas and pinholes. After the product has had time to set up, he knocked it down with a 36-grit disc on an 8-inch random orbit sander. Be sure to use only the 3M product for filling the body seams, as it dries very hard, making it difficult to use for body shaping. View Related Article
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