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For large-scale boat interior refits and fiberglass prep, electric random orbital sanders (ROS) offer superior control and longevity compared to consumer-grade battery-powered models. For heavy material removal, a single-speed orbital sander works quickly, though a variable-speed Makita model provides better precision to avoid burning through thin fiberglass laminates. When working in tight spaces or removing foam core, a die grinder with quarter-inch bits proves essential for creating coves and clearing material. For large, flat surfaces, a 7-inch polisher/sander set to 600 RPM allows for effective prep with minimal dust dispersion. While pneumatic dual-action (DA) sanders are preferred for their lightweight design and tactile feedback—which helps identify high spots—electric clones of professional-grade tools like the Mirka offer a cost-effective alternative for long-term projects. For manual finishing, long boards over 16 inches ensure flat surfaces, while custom-routed sanding blocks provide consistent radii for tight corners and edges.

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