BoatworksToday · video

What this video covers

A 1-1/8 inch by 21-inch belt sander serves as a primary tool for fiberglass boat repairs, particularly for shaping, prepping stress cracks, and removing gel coat around hardware holes.0:41 The long-neck design allows access to tight cockpit and cabin spaces, while the tool's head diameter matches common boat radii.0:54 Variable speed control is essential for finesse work, as running the sander at low speeds improves material removal accuracy and dust collection efficiency.1:42 When using the tool for surface preparation, holding a vacuum hose directly behind the belt captures 90-95% of airborne dust.3:15 For fiberglass layup prep, 36 to 40-grit belts provide the most effective material removal, while 80 to 120-grit belts suit fairing compounds.10:00 A wider 1-1/8 inch belt offers better stability and prevents the surface scalloping often caused by narrower 3/8 inch models.6:13 While professional-grade units like the Makita model remain durable over 15 years of heavy use, lower-cost alternatives are viable for one-off projects provided they feature variable speed and the wider belt width.7:19

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