Casting and Fabrication Supplies & Accessories

A variety of grinding, sanding, buffing and polishing media.

  • Grinding
  • Sanding Supplies
  • Buffing and Finishing Compounds

Marshall Gruber offers a variety of abrasive disk media for use in grinding, sanding, blending, buffing and polishing applications. If you don't see what you need here, please call Marshall-Gruber's Customer Service Desk at (866) 260-6457 for alternatives.


Grinding Media

Grinding Discs

These 7" diameter fiber backed grinding discs have been engineered using the latest in electrostatic grain placement technology. Designed for blending, sanding and finish work. These discs are available in a variety of grits, grains and sizes, and feature a special mix of grain for high performance and life. Quality grinding discs for a variety of cast polymer casting and finishing requirements: 

T8332 24 250

7" Diameter, 24-Grit Grinding Discs

Firm 7" diameter fiber backed silicon carbide grinding discs provides fast material removal cast polymer and other materials. For 7/8" Arbors

Order Information:
7” Disc - 24 grit - Box/50 - #T8332-24

102061

7" Diameter, 24-Grit Grinding Discs

  • Aluminum Oxide
  • Silver Line
  • For ferrous metals, iron, steel & sheet metals
  • Max RPM: 8,550

Order Information:
Grinding Disc, 7" x 7/8" 24-Grit Disc (Box/25) - #102061B

4700 1 1

7" Diameter, 36-Grit Grinding Discs

Order Information:
7” Discs, 36 grit - Box/50 - #T6514-36

102061

7" Diameter, 36-Grit Grinding Discs

Order Information:
7” Discs, 7” x 5/8”, 36 grit - Box/25 - #102063B


Sanding Media

  • Sandpaper Sheets
  • Sanding Discs
  • Sanding Belts
  • Backing Pads and Sanding Blocks

Wet/Dry Sandpaper Sheets

Quality sandpaper for a variety of cast polymer casting and finishing requirements:

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Mirka Wet/Dry Sandpaper

Carat White Sheets

Order Information:
60D grit - Pack/50 - #SPM60W
180 grit - Pack of 50 - #SPM180W
220 grit - Pack of 50 - #SPM220W
400 grit - Pack of 50 - #SPM400W
600 grit - Pack of 50 - #SPM600W
600 grit - 50 sheets/sleeve; 10 Sleeves/box - #SPM600WC
1000 grit - Pack of 50 - #SPM1000W

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Eagle Wet/Dry Sandpaper

9 x 11” sheets for wet/dry applications. Sleeve of 50 sheets.

Order Information:
80 grit - Sleeve - #SPE80
100 grit - Sleeve - #SPE100
120 grit - Sleeve - #SPE120
180 grit - Sleeve - #SPE180
220 grit - Sleeve - #SPE220
320 grit - Sleeve - #SPE320
400 grit - Sleeve - #SPE400
600 grit - Sleeve - #SPE600
800 grit - Sleeve - #SPE800
1000 grit - Sleeve - #SPE1000
1200 grit - Sleeve - #SPE1200


Sanding Discs

Quality sanding discs for a variety of cast polymer casting and finishing requirements:

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STIKIT™ Sanding Discs

SPD Series 5" Diameter Discs:
Order No. Diameter Grit Qty
SPD80-5 6" 80 100
SPD120-5 6" 120 100
SPD150-50 6" 150 100
SPD180-50 6" 180 100
SPD220-50 6" 220 100
SPD320-50 6" 320 100
SPD400-50 6" 400 100
SPD600-50 6" 600 100

SPD Series 6" Diameter Discs:
Order No. Diameter Grit Qty
SPD80-6 6" 80 100
SPD120-6 6" 120 100
SPD150-6 6" 150 100
SPD180-6 6" 180 100
SPD220-6 6" 220 100
SPD320-6 6" 320 100
SPD400-6 6" 400 100
SPD600-6 6" 600 100
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6" Velcro Dustless Sanding Discs
Order No. Diameter Grit Qty
SPD80-6V 6" 80 100
SPD120-6V 6" 120 100
SPD150-6V 6" 150 100
SPD180-6V 6" 180 100
SPD220-6V 6" 220 100
SPD320-6V 6" 320 100
SPD400-6V 6" 400 100
SPD600-6V 6" 600 100

Sanding Belts

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Sanding Belts

For Belt Sanders using 3" x 21" belts.

Order Information:
3″ x 21″, 40 grit – Box/10 – #SB321-B

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Backing pads and Sanding Blocks for hand sanding.

Call for information


Buffing and Polishing Compounds

  • Buffing Bricks
  • Marble Buffing Licks
  • Wool Buffing Pads
  • Buffing Pad Cleaning Tool

Buffing Bricks

buffing bricks

Buffing Bricks are an all-purpose fine abrasive compound that is ideal for everything from buffing minor scuffs and scratches on mold surfaces to polishing of finished parts. Use on molds after final sanding. Product is a unique wet/sharp silica-based compound. Formulated in a dry, brick-like form, buffing bricks are sold separately in two separate box quantities, or per pound in drum.

3 lb bricks, sold individually or 10 per box.

Color/Style Grit Individual Box/10
Blue (WP-12) Sharpest #010153J #0101535J
White (WP-1) Mild #010154J #0101545J
Green (WP-5) Medium #010155J #0101555J


Marble Buffing Licks

Surface finishing compounds for Marine • Consumer Composites  • Transportation • Windmill Blades • Aircraft

0101561 sm

WP-1 (White) - Mild Aggressive

For fiberglass, cast polymer other gel-coated, composite surfaces. Removes orange peel, sand paper marks. Results - clean, high luster finish. 10" x 10" x 8" box - (approx. 50 lbs)

Order Information:
Individual 3 lb Lick - #010154J
Box/10 - #_______
50 lb Box - #0101561 (shown above)

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2F (Beige) - Sharp/Aggressive Cut, Wet

Developed for use on gel coated surfaces requiring rework, or refurbishment. Exceptional at removing oxidation, scratches, stains, and other minor imperfections. Extremely well suited for mold maintenance. 10" x 10" x 8" box - (approx. 50 lbs)

Order Information:
Individual 3 lb Lick - #
50 lb (each) - #010158

010159 sm

WP-12 (Blue) - Most Aggressive

Finishing Compound for fiberglass, and cast polymer, other gel-coated, composite surfaces. Removes orange peel, surface imperfections, scratches, and sand paper marks. Results: Clean, high luster finish. 10" x 10" x 8" box - (approx. 50 lbs)

Order Information:
Individual 3 lb Lick - #
50 lb (each) - #010159

Wool Buffing Pads

Made of long-lasting heavy-duty, all wool fiber, these 8" diameter Buffing Pads are intended for use with rotary buffers. They include a semi-rigid canvas backing. Buffing Pads come in several styles with or without hook and loop fasteners.

Note: Available individually, or in case of 36 from Rockledge Warehouse. From the Texas warehouse, they ship in case units only.

010165 SM

100% Wool Buffing Pads

Order Information:
Pad, 1-1/2” Wool, Each - #010165 (shown at left)* (Rockledge Warehouse only)
Pad, 1-1/2” Wool, Case of 36 - #0101652
Pad, 1-1/2” Wool, Case of 36 - #010166
Pad, 1-1/2” Wool w/Soft Curve, Each - #010167* (Rockledge Warehouse only)
Pad, 1-1/2” Wool w/Soft Curve, Case of 36 - #010168

010163 SM

50% Wool, 50% Polyester Blend Buffing Pads

Order Information:
Pad, 1-1/2” Blend, Each - #010163 (shown at left)* (Rockledge Warehouse only)
Pad, 1-1/2” Blend, Case of 36 - #010164
Pad, 1-1/2” Blend w/Soft Curve, Each - #010175* (Rockledge Warehouse only)
Pad, 1-1/2” Blend w/ Soft Curve, Case of 36 - #010176

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50% Wool, 50% Polyester Blend Buffing Pads with Velcro Backing

Order Information:
Pad, 1-1/2” Velcro Wool, Each - #010179* (Rockledge Warehouse only)
Pad, 1-1/2” Velcro Wool, Case of 36 - #010180

Other Buffing Pads

Other Buffing Pads

Order Information:
Pad, 50/50 1-1/2" Wool, Case of 36 - #010164B
Pad, Double Face, Box/1 - #0101664C
Buffing Pad, Finishing (Fine), 7”, Case of 36 - #010149
Superbuff 2+2 White, Case of 24 - #DS010182
Superbuff 2+2 Double Sided Yellow, Case of 24 - #DS010184

01017 sm

Buffing Pad Cleaning Tool

This simple tool extends the life of your buffing pads by breaking-up dried compound and removing it from the pad. Many users recycle their cleaning pads once they are full of compound, and purchase refurbished replacement pads. This tool minimizes the amount of compound that accumulates on the pad by breaking up and removing dried compound from the pad – thus extending the life of the pad, and reducing your costs of purchasing new and/or refurbished replacement pads.

Description/Order Number:
Buffing Pad Cleaning Tool – #01017