7940 Siaair 6″ Foam Sanding Disc – 360 Grit Medium-Fine Prep

The 7940 Siaair 6″ Sanding Disc (360 Grit) is the ideal abrasive for the aggressive stages of fine surface preparation. Positioned as a medium-fine grit, it provides the perfect balance of cutting power and finish quality. It is exceptionally effective for shaping primer fillers, smoothing out body filler edges, and scuffing old paint or clear coats to create a mechanical bond for new layers. Unlike standard paper discs that can be too harsh, the 360 grit Siaair delivers a controlled cut that speeds up workflow without gouging the surface, ensuring a flat, uniform base for further refinement.

Adaptive Foam Backing for Complex Contours

The defining feature of the 7940 series is its specialized foam-backed construction, which offers a distinct advantage over rigid abrasives. This cushioning layer allows the 6-inch disc to adapt effortlessly to convex and concave shapes, body lines, and bumper curves. By equalizing the pressure applied during sanding, the foam prevents “finger marks” and significantly reduces the risk of cutting through edges. This adaptability makes it a top choice for wet sanding applications, where the foam sponge absorbs water to keep the surface cool and lubricated, preventing heat-related damage to plastic or composite parts.

Extended Lifespan with Anti-Clog Technology

Engineered for high-performance shops, the 7940 Siaair minimizes downtime through advanced durability. It features premium aluminum oxide grains bonded with a robust resin-over-resin structure that allows for an open, breathable sanding action. This design actively resists clogging (loading), even when working on softer primers or varnishes.