Description
3M 787c 4 1/2" 36 Grit Sanding Discs (25/Pk) | Boat Supply Store
Achieve aggressive material removal and surface refinement on fiberglass and gelcoat with these 4 1/2" 36-grit sanding discs. Engineered with a durable fiber backing and a resin-bonded abrasive, they deliver consistent performance for critical hull repairs and finishing applications. Ideal for preparing surfaces prior to gelcoat application or removing imperfections on vessels operating in coastal saltwater environments.
Key Features
- Aggressive Cutting for rapid material removal with 36-grit coarseness.
- Durable Fiber Backing provides robust support for demanding applications.
- Resin Bonding ensures abrasive grain stays securely in place for extended life.
- Consistent Surface Finish for reliable preparation of marine substrates.
- Corrosion Resistant construction suitable for marine environments.
- High-Performance Abrasive effectively tackles fiberglass and gelcoat.
- Bulk Pack of 25 discs minimizes reordering frequency.
- Designed for Angle Grinders ensuring compatibility with common marine tools.
Specifications
| Product Specifications | |
|---|---|
| Diameter | 4 1/2 inches |
| Grit | 36 |
| Backing Type | Fiber |
| Bonding | Resin |
Who This Is For
Marine professionals and dedicated DIYers requiring high-performance abrasive discs for aggressive material removal on fiberglass and gelcoat. Ideal for boat builders and repair shops focused on achieving superior surface finishes for structural and cosmetic work.
How It Compares
| Feature | 3M 787c 4 1/2" 36 Grit Sanding Discs (25/Pk) | Diablo |
|---|---|---|
| Diameter | 4 1/2 inches | 4 1/2 inches |
| Grit | 36 | 36 |
| Backing Type | Fiber | Fiber |
| Bonding | Resin | Resin |
Common Concerns Answered
Will these discs wear out too quickly on tough marine surfaces?
Engineered with a durable fiber backing and resin bonding, the 3M 787c discs are designed for extended life and consistent performance, even on demanding fiberglass and gelcoat applications.
Are these discs suitable for wet sanding applications?
These discs are primarily designed for dry sanding applications. For wet sanding, consult specific product documentation for optimal use.
Is 36-grit too aggressive for finishing?
36-grit is an aggressive grit ideal for rapid material removal and initial surface preparation. For finer finishes, subsequent sanding with higher grit discs is recommended.
Frequently Asked Questions
What is the primary use for 36-grit sanding discs?
36-grit is an aggressive grit used for rapid material removal, shaping, and preparing surfaces for further finishing steps in marine applications like fiberglass repair.
What types of marine materials are these discs most effective on?
These discs are highly effective on fiberglass, gelcoat, and other composite materials commonly found in boat construction and repair.
What is the center hole size of these discs?
The product details indicate a 7/8 inch center hole, which is standard for most angle grinders used in marine maintenance.
How many discs are included in this package?
This package contains 25 sanding discs.
Can these discs be used on metal surfaces?
While primarily designed for fiberglass and gelcoat, these discs can be used on certain metal applications for aggressive material removal, but their optimal performance is on composites.
