Skip to Primary Navigation Skip to Site Navigation Skip to Main Content All 3M.com Site Map

Marine Gel Coat Finishing

Getting a perfect finish on your Gel Coat is imperative in the creation of moulds and general hull finishing. 3M have selected the most effective products from our range to give optimum performance across the variety of gel coats found in the marine industry. Click through the process and drill down to the individual products for more information or purchase.

Download PDF

Preparation

Sand the surfaces using a P240 disc on a dual action sander with 5mm orbit or less. Always start the sander on the panel. Depending on the condition of your Gel Coat this stage may not be required - in most cases you will be able to start from P500.

Key Products

3M™ Hookit™ Purple+ Multihole Disc 334U P240 50529

3M™ Hookit™ Purple+ Multihole Disc 334U P240 50529

Spiral multihole premium disc with enhanced anti-loading coating

3M™ Central Vacuum Random Orbital Sander

3M™ Central Vacuum Random Orbital Sander 20461

Provides the power and performance to get the job done with even better results

3M™ Portable Dust Extraction Unit

3M™ Portable Dust Extraction Unit 64401

For use with 3M™ Central Vacuum Random Orbital Sander 20461

Distributor Finder

Sanding

Here there are three levels of refinement needed to achieve a scratch depth ready for compounding.

  • Step 1 P500
  • Step 2 P800/1000
  • Step 3 P1500

To make sure you get maximum life from your abrasive always use dust extraction. To get a uniform finish rotate between sanding horizontally and vertically across the surface per abrasive grade.

Key Products

3M™ Hookit™ Purple+ Multihole Disc 334U P500 50534

3M™ Hookit™ Purple+ Multihole Disc 334U P500 50534

Spiral multihole premium disc with enhanced anti-loading coating

3M™ Clean Sanding Disc 360L P800 01711

3M™ Clean Sanding Disc 360L P800 01711

A disc with precise multiple holes for improved dust extraction

3M™ Clean Sanding Disc 360L P1000 01712

3M™ Clean Sanding Disc 360L P1000 01712

A disc with precise multiple holes for improved dust extraction

3M™ Microfinishing Hookit™ Discs

3M™ Microfinishing Hookit™ Discs 260L P1500 50238

Constructed of high performance, aluminium oxide mineral to leave a consistent finish

Distributor Finder

Compounding

Compounding is carried out with one aggressive compound that removes the scratch pattern left by the abrasive steps but also creates shine. Always wipe the surface before compounding - start with medium pressure then lighter towards the end to clean up. Use a rotary polisher running at 2000 RPM or less.

Key Products

3M™ Electric Polisher 64393

3M™ Electric Polisher 64393

Impressive power to weight ratio for improved comfort and performance

3M™ Hookit™ Backup Pad 05717M

3M™ Hookit™ Backup Pad 05717M

Provides quick change advantages while producing exceptional finishes on gelcoat

3M™ Perfect-it III™ Fast Cut 09374

3M™ Perfect-it III™ Fast Cut 09374

A fast-acting liquid abrasive

3M™ Wool Compound Head 05711

3M™ Wool Compound Head 05711

Single sided blended wool compounding pad

Distributor Finder

Polishing

The finish is further improved by another machine polishing step with a less aggressive polish designed to remove any haze/swirls from compounding. The finish that you are left with will be high gloss to the eye.

Key Products

3M™ Electric Polisher 64393

3M™ Electric Polisher 64393

Impressive power to weight ratio for improved comfort and performance

3M™ Hookit™ Backup Pad 05717M

3M™ Hookit™ Backup Pad 05717M

Provides quick change advantages while producing exceptional finishes on gelcoat

3M™ Finesse-it™ Finishing Material 09048E

3M™ Finesse-it™ Finishing Material 09048E

Designed for scratch, swirl and light oxidation removal while also restoring shine

3M™ Wool Polishing Head 05713

3M™ Wool Polishing Head 05713

Single sided blended wool compounding pad

Distributor Finder

Protection

Finally, apply a thin coat of wax by hand using a microfiber cloth to protect the gelcoat surface. The easy-on/easy-off formulation will save time and effort and allow you to get more life from each mould.

Key Products

3M Marine Ultra Performance Paste Wax 09030

3M Marine Ultra Performance Paste Wax 09030

Long lasting natural protection

3M™ High Performance Cloths 60668

3M™ High Performance Cloths 60668

Washable non scratching, low linting microfiber cloths

Distributor Finder

Please contact us for more information on Marine Processes