The Mirka 40-341-080 Coarse Cut PSA Disc, 6" is a 6-inch adhesive-backed sanding disc made for aggressive material removal. This is a sanding disc designed for coarse sanding on lacquer, putty, glass reinforced polyester, and welding seams. Model Number: 40-341-080. If you need to knock down material quickly before moving to finer grits, this is the kind of abrasive that earns its keep early in the sanding process.

The big story here is the P80 grit. That puts this disc squarely in the heavy-cut category, where speed matters more than finish quality. It is intended for shaping, leveling, and cleaning up surfaces that still need more refinement afterward. For bodywork, fabrication prep, or rough surface correction, that coarse cut helps remove material without wasting time.

Mirka also calls out why this abrasive is meant to last longer under hard use. The disc uses a coated construction with specially reinforced backing material and Mirka Progressive Bond technology. The practical benefit is better edge strength during aggressive sanding, especially around metal edges where cheaper discs tend to fray, tear, or leave inconsistent scratch marks once the edge breaks down.

Another useful detail is that the disc is described as having minimal clogging and flexibility on rounded surfaces. That matters when you are working on contoured parts or uneven repairs where a stiff, loading-prone abrasive can slow you down fast. For users sanding filler, coatings, or composite surfaces, less clogging usually means more consistent cutting before the disc needs to be changed out.

This Mirka sanding disc uses PSA backing, which means pressure sensitive adhesive attachment. That setup is best for users who want a firm bond between the disc and the sanding pad. It is listed as compatible with an angle grinder, so it fits applications where an aggressive abrasive disc is being used on powered equipment for fast removal work.

Who should buy it? This is a good fit for automotive refinish work, metal prep, fiberglass repair, and general coarse sanding where surface removal comes first and finish quality comes later. If you are doing rough prep on putty, lacquer, reinforced polyester, or weld seams, the Mirka 40-341-080 Coarse Cut PSA Disc, 6" makes sense. If you are looking for a finish-ready scratch pattern, you will want to step down to a finer grit after this stage.

Mirka 40-341-080 Coarse Cut PSA Disc, 6" is for the rough stuff

This is the kind of abrasive you grab when the job is still ugly and you need to remove material fast.

• Who it's for: Automotive techs, metal fabricators, fiberglass repair users, and anyone doing heavy prep on filler, coatings, or weld areas.
• Why it stands out: The P80 cut, reinforced backing, and reduced edge wear focus on one thing: staying useful during aggressive sanding instead of falling apart early.
• Worth knowing: This is a coarse sanding disc, so do not expect a finish-ready surface. Plan on following it with finer grits if appearance matters.

• What grit is this disc? It is P80, which is a coarse grit intended for aggressive sanding and material removal.
• What materials is it described for? Source data lists lacquer, putty, glass reinforced polyester, and welding seams.
• What size is the disc? The disc is 6 inches in diameter.
• Where is it made? The product marking shown in the source image states it is made in Finland.