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Proflex Clear Blue Primer

£33.01£105.60 (inc. VAT)

Tough flexible epoxy, used as a primer for all Liquid EPDMs where required.



Proflex Clear Blue Primer is the primer to be used with all the LiquidRubber EPDMs when you’re repairing your fibreglass or EPDM roofs. It’s also the primer of choice when using Liquid Roof for your motor home and caravan roof repairs.

It is a solvent-free solution that gives great adhesion as well as being applicable at colder temperatures. It’s many benefits include:

  • 100% solids for low odour during installation.
  • Less hazardous.
  • Self-priming and levelling on properly prepared surfaces.
  • Strong adhesion to wide variety of substrates.
  • Self-levelling when sufficient material is applied.
  • Fills depressions and cracks.
  • Absorbs movement to help prevent reflective cracking.
  • Remains flexible over a wide range of temperatures.
  • Adheres to asphalt substrates.


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Applying ProFlex over smooth non porous surfaces
Smooth Aluminum, New Galvanized Steel, Glass and Plastics such as ABS, Polypropylene, PVC, Polystyrene, and Acrylic must be primed with Proflex Primer® to improve adhesion. Hypalon and other Thermoplastic Olefin membranes must also be primed with Proflex Primer.

Using ProFlex Primer on spray On Urethane Foams
Since there can be considerable variations in density we recommend priming all roof foams with Proflex Primer in order to produce a uniform surface and improve adhesion to the rubber.

Applying ProFlex Primer over Previously Painted Surfaces
Epoxy and Urethane patching products, caulks and coatings must be primed with Proflex Primer to improve adhesion.

Applying over porous surfaces
When applying over porous substrates, use Proflex Primer to stabilize the surface.

Applying over Masonry or Concrete
With masonry / concrete, the surface to be coated must be relatively smooth (steel troweled) and uniform (not honey-combed, full of imbedded stones or aggregate breaking the surface, etc.). The surface must be structurally stable, dry, non-porous, and free of oils, debris, and flaking or loose paint. New (green) concrete should be aged 10 days. Fill any cracks, or spalling or other surface defects on the concrete surface with Proflex Flexible Epoxy, Butt Putty Crack Filler Gel or ProFill to level and smooth out the surface.

When to use Proflex with Liquid EPDM
Using Proflex Primer with EPDM Liquid Rubber An example of substrates that need to be coated with Proflex Primer prior to application of EPDM Liquid Rubber are:

• Wood
• Plywood
• Concrete

ProFlex Primer Technical Data

Impact Resistance: > 174 inch-lbs.
Mandrel Bend: 1/8” no crack
Color: Clear Blue
7 days 15 days
Tensile Strength – Ambient: 808 psi 1390 psi
Tensile Strength – Chilled: 3900 psi 6610 psi
Elongation – Ambient: 139 % 132 %
Elongation – Chilled: 68 % 27 %
Modulus of Elasticity – Ambient: 79.7 psi 331 psi
Modulus of Elasticity – Chilled: 1150 psi 1180 psi
Hot Tire Print No permanent imprint @ 2 hrs., 140°F

ProFlex Primer Application Guidelines
• Rigid Foams
• Previously Painted Surfaces
• Spray on Urethane Foams

When applying over the above substrates, use Proflex Primer to stabilize the surface. The “porosity” of concrete / masonry can be somewhat subjective and needs to be addressed prior to applying EPDM Liquid Rubber on such surfaces. When in doubt and when time permits, prepare the surface as above and apply a 20 mils dft coat of EPDM Liquid Rubber to a test section. Check when cured in about 4 to 10 days, for surface “bubbling” and adhesion. Bad adhesion and “bubbling” indicates that the structure is too porous. In such a case, or when testing times do not permit, it is recommended you apply a coat of Proflex Primer on the concrete first, to “fill in the pores”, let partially cure, and then apply the EPDM Liquid Rubber over the Proflex Primer following the instructions.

Thinking of spraying ProFlex Primer Blue?

Mix Ratio: 1:1 by volume
Density: 9.44
Viscosity (Brookfield): 750 cps
Gel Time: 55 min.
Cure Time: 24 hours
Shore D Hardness (72 hrs): 52
Adhesion (aged): 100% @ 730 psi