Repair Tools & Materials

A pencil kit was used to quantify the hardness (left) of coupons molded in a thermoplastic cup. The coupons were also used to compare adhesion (right); some easily popped out of the plastic mold, but others managed to adhere throughout dry and wet tests.

Testers Check Epoxy Sandability, Adhesion, and More

Testers evaluated sandability, resistance to sag, cure time, and adhesion using sample fiberglass panels with 3-by-3-inch test swatches. The fairing compounds were applied and cured in temperatures ranging from the low 60s to the mid-80s. Each test was repeated three times, and the results were averaged. The shaping test involved closely timed periods of even sanding using a block sander and new sheets of 80-grit sandpaper. Testers observed each material’s tendency to clog the sandpaper, and measured the volume of accumulated dust after four minutes of sanding.

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