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Quantum 45 Epoxy Surfacing Primer Base

$66.66Limited StockSee Product Details
Quantum 45 Epoxy Primer Gray Base
Quantum 45 Epoxy Primer White Base

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Product Details

Quantum 45 is a two-part epoxy primer system that provides exceptional filling, excellent adhesion, and superior corrosion protection for wood and fiberglass/gelcoat surfaces.

It consists of a single base component (Quantum 45 epoxy surfacing primer base), and 2 different activators: Quantum 45 primer activator, and Quantum HB high build activator (both sold separately). The correct activator depends on the condition of the boat you are priming.

For unblemished surfaces, mix the primer base with Quantum 45 Epoxy Primer Activator. If your boat has gouges and other surface defects, mix the same primer base with Quantum HB High Build Epoxy Activator and apply up to 20 wet mils every 1 to 3 hours.

Quantum 45 is easy to mix and apply by spray, foam roller, or brush. Available in quart and gallon sizes in gray and off-white colors.

Info & Guides
Coverage @ 1 Mil (No Loss)(Surfacing Primer): 800-850 FT2/GAL
Coverage @ 1 Mil (No Loss)(High Build Primer): 850-900 FT2/GAL
Volume Solids (Admixed)(Surfacing Primer): 51 +/-2%
Volume Solids (Admixed)(High Build Primer): 61 +/-2%
VOC (Admixed): <420 G/L (3.5 LBS/GAL)
Dry to Sand (>4 Mils): 16 Hours @ 72°F
Full Cure: 72 Hours @ 72°F
Pot Life: 8 Hours @ 72°F
Warning: Do not apply paint materials to surfaces less than 5°F above dew point, or to surfaces warmer than 125°F. Substrate temperature should be minimum 45°F to maximum 125°F.

Technical Information


  • Application method: Spray, brush, or foam roller.
  • Temperature Range: 45°F to 125°F
  • Surface Preparation (Wood/Fiberglass): Abrade with 150-grit sandpaper.
  • Surface Preparation (Previously Painted Surfaces): Abrade with 150-grit sandpaper to remove gloss.
  • Surface Preparation Cleaning: Solvent clean with Quantum Surface Prep Cleaner using lint-free cloth and the two-rag, wipe-on/wipe-off method.
  • Mix Ratio: 1:1 for spray, brush, or foam roller application.
  • Reduction (Surfacing Primer): Not normally recommended. However a 10-20% reduction by volume of the admixed primer with Quantum45 Epoxy Primer Spray Reducer may be used.
  • Reduction (High Build Primer): A 20-30% reduction by volume of the admixed primer with Quantum45 Epoxy Primer Spray Reducer may be used for proper application.
  • Induction Period: 30 minutes, prior to reduction and application.
  • Application (Surfacing Primer): In subsequent coats, apply up to 12 total wet mils, waiting 1-3 hrs. between coats. See Surfacing Primer How To for application details.
  • Application (High Build Primer): In subsequent coats, apply up to 20 total wet mils, waiting 1-3 hrs. between coats for spray; 12-14 hrs. for brush. See High Build Primer How To for details.
  • To Accelerate Cure Time: Add Quantum45Cold Cure Epoxy Primer Accelerator, up to 6 oz./mixed gallon, 1 oz. for every 5°F below 75°F.
  • Adhesion Promoter: Use Quantum Adhesion Promoting Surface Treatment (sold separately) before application to ensure strong adhesion of this coating.