Description
3M 787c Sanding Discs 4 1/2" 60 Grit (25pk) | Boat Supply Store
Achieve superior surface preparation for gelcoat and fiberglass with these 4 1/2" diameter, 60-grit sanding discs. Featuring a proprietary ceramic mineral blend, these discs deliver aggressive yet controlled material removal, ideal for hull smoothing or paint stripping prior to recoating. Their 7/8" center hole ensures precise mounting on standard angle grinders and polishers, making them critical for tasks like preparing a Bertram hull for a new paint job in challenging saltwater environments.
Key Features
- Aggressive Material Removal with 60-grit ceramic mineral blend.
- Durable Construction for extended abrasive life.
- Versatile Application on fiberglass, gelcoat, and metal.
- Reduced Loading for consistent performance.
- Precise Fitment with standard 7/8" center hole.
- Consistent Finish across multiple applications.
- Efficient Surface Preparation for optimal coatings.
- Professional Grade Durability for demanding marine tasks.
Specifications
| Product Specifications | |
|---|---|
| Diameter | 4 1/2 inches |
| Grit | 60 |
| Mineral Type | Ceramic |
Who This Is For
Boaters and marine professionals requiring efficient material removal for hull preparation and finishing tasks. Ideal for those working with fiberglass, gelcoat, and metal surfaces in marine environments.
How It Compares
| Feature | 3M 787c Sanding Discs 4 1/2" 60 Grit (25pk) | Norton Blaze |
|---|---|---|
| Diameter | 4 1/2 inches | 4 1/2 inches |
| Grit | 60 | 60 |
| Mineral Type | Ceramic | Ceramic |
| Center Hole | 7/8 inches | 7/8 inches |
Common Concerns Answered
Will these discs load up quickly on gelcoat?
The 3M 787c discs are engineered with a durable ceramic mineral blend designed to resist loading, ensuring a consistent cut and longer product life even on challenging surfaces like gelcoat.
How aggressive is a 60-grit disc?
A 60-grit abrasive provides a robust cutting action suitable for significant material removal, such as shaping fiberglass or stripping old paint, preparing the surface for subsequent finer grits or coatings.
Can I use these on metal surfaces?
Yes, the aggressive nature of the 60-grit ceramic mineral makes these discs effective for preparing metal surfaces, removing rust, or smoothing welds before finishing.
Frequently Asked Questions
What is the primary use for 60-grit sanding discs on a boat?
60-grit discs are best for initial heavy-duty surface preparation, including removing old paint, smoothing repairs, or shaping fiberglass components on a boat hull.
What type of tool is required for these 4 1/2" sanding discs?
These discs are designed to be used with standard angle grinders or polishers equipped with a 7/8" arbor.
What is the benefit of using ceramic minerals in abrasives?
Ceramic minerals offer superior hardness and durability compared to conventional abrasives, allowing for faster cut rates and longer disc life, especially under heavy-duty applications.
How many discs are included in this package?
This package contains 25 individual sanding discs.
Are these discs suitable for fine finishing or paint polishing?
No, 60-grit is an aggressive grit intended for initial material removal and surface preparation. For fine finishing or paint polishing, you would need much finer grit discs, such as 220-grit or higher.
