Blue Seal is a two-part epoxy-vinyl-ester coating system with glass flake incorporated for superior chemical resistance. Blue Seal is extremely durable and immune to corrosion, cavitation and electrolysis.

Typical Uses

  • marine: hulls, decks, tanks, holds, pumps, impellers, valves, piping, housings, heat exchangers, propellers, Kort nozzles, thruhull fittings, jet tunnels, tubes, rudders, manifolds, etc
  • wastewater treatment plants
  • power industry
  • pulp and paper mills
  • transportation


  • Immune to corrosion, cavitation and electrolysis
  • High adhesive strength: steel-5,700 psi/401 kg/cm2, aluminum 4,500 psi/316 kg/cm2
  • Excellent chemical resistance
  • Virtually impermeable to liquids and vapors
  • Durable and resistant to impact and abrasion damage coverage


Base and topcoat: 60 sf per US gal/1.3 m2 per kg@ 10 mils/250 microns per coat

Reinforcement43 sf per US gal/1.0 m2 per kg@ 15 mils/380 microns per coat

Surface Preparation

Abrasive blast surfaces to white metal (SSPCSP5) with 4-6 mil/100150 microns profile. Smooth out weld seams and sharp edges. If applying on concrete, high pressure water or abrasive blast. Fill and reinforce any cracks. Ensure all surfaces are clean, dry and free from contaminants. Apply coating immediately after blasting.

Mixing Instructions

Thoroughly mix product after opening container. For large containers, use a power mixer. Pour into a plastic mixing container only the amount of Blue Seal that may be applied within 15 minutes. Do not use a mixing paddle that has been used with catalyzed material. Add catalyst at a ratio of 11/2%. For faster set time, increase catalyst to a maximum of 3%. To extend working time, decrease catalyst to a minimum of 3/4%.

Working Time – Minutes 50˚F 60˚F 77˚F 90˚F
Catalyst Ratio 3% 2% 1% 1%
2 quart/1kb container 25 20 15 10


Brush recommended for small areas.
For best adhesion, first apply one layer of basecoat at 10-15 mils/250-300 microns thickness. Thoroughly rub basecoat onto surface to fill any voids and to ensure 100% coverage. Brush on one layer of reinforcement, then trowel on second layer of reinforcement. Sand any surface imperfections, then apply one layer of topcoat.

Sprayer recommended for large areas.
Use conventional airless gelcoat, wet out or fiberglass resing spray equipment. For best results, use a postcatalyzing spray system that mixes the coating with catalyst after leaving the tip of spray gun, and apply one base coat, one to two reinforcement coats and one top coat.

Air motor/pump ratio (min.) ………. 37:1
Catalyst-coating pump ratio ……….. 1.25%
Tip orifice ………………………………….. .052 in.
Spray angle ……………..…………………. 40 degrees

Curing Schedule

Ambient Temp. 50˚F 60˚F 77˚F 90˚F
Catalyst Ratio 3% 2% 1% 1%
Tack Free 60 min. 45 min. 30 min. 20 min.
Light Load 5 hrs. 4 hrs. 3 hrs. 2 hrs.
Full Load 24 hrs. 24 hrs. 18 hrs. 12 hrs.
Chemical Load 24 hrs. 24 hrs. 18 hrs. 12 hrs.

Clean Up

Blue Seal cures to a solid mass very quickly. Clean alequipment immediately after use with acetone. Do not allow any material to remain in hoses, guns or spray equipment.

Technical Data

Compressive Strength – ASTM – D695 22,000 psi 1,547 kg/cm2
Compressive Modulus 1, 700,000 psi 119,522 kg/cm2
Flexural Strength – ASTM – D790 16,000 psi 1,125 kg/cm2
Flexural Modulus 845,000 psi 59,409 kg/cm2
Tensile Strength – ASTM – D638 14,500 psi 1,109 kg/cm2
Tensile Modulus 2,460,000 psi 172,955 kg/cm2
Impact Resistance – ASTM – D256 4.42 ft-lb/in 236J/m
Shore D Hardness – ASTM – 02240 88.2
Dielectric Strength – ASTM –  ASTM 0149 20,000 volts/mm
Heat Deflection – ASTM – 068 145o F 680 C


After coating, surfaces should be inspected with a porosity/ holiday detector. All defects must be re-coated and re-tested.


Blue Seal is packaged in US quart, one gallon and five gallon pails. For international shipments, product is sold by weight in 1, 5 and 20 kg units. Sufficient catalyst is included with all coating units. Additional glass flake may be ordered as needed.


Store unopened containers in dry, shaded conditions away from heat and ignition sources and above freezing temperatures. For best results, store at a temperature range of 600 F/16o C to 770 F/25o C.

Shelf Life

Six months when stored at 680 F/20o C.

Standard Colors

Blue Seal is available in blue, grey, white and black as standard colors. Custom colors are available – exact color match is not guaranteed.


When applying Blue Seal, always wear gloves and appropriate protective clothing. If spraying in confined areas, use full body protection and a fresh air-fed mask and any other required confined space safety equipment. See MSDS sheet for further product information prior to handling product. Blue Seal is for industrial and professional use only. All application instructions must be followed.

Chemical Resistance

Blue Seal is resistant to a wide variety of chemicals and liquids, some of which are listed below. For a full listing of chemical resistance please contact your Blue Seal distributor.

Aluminum Sulfate 10%
Barium Hydroxide
Benzoic Acid
Calcium Hydroxide
Distilled Water
Fertilizer Solution
Gasoline, Leaded & Unleaded
Hydrobromic Acid 48%
Hydrochloric Acid 36%
Hydroflouric Acid 20%
Magnesium Hydroxide
Mineral Spirits
Nitric Acid 40%
Phosphoric Acid
Potassium Hydroxide 45%
Sodium Hydroxide 50%
Stearic Acid
Sulfuric Acid 75%
Tartaric Acid
Sea Water


Blue Seal Inc. will replace any material found to be defectiveBlue Seal Inc. disclaims all warranties expressed, or implied, including warranties of merchantability and fitness for a particular purpose or use. Liability, if any, is limited to product replacement only.