Devcon DFense Blok™ Surface Wetting Agent



Devcon DFense Blok™ Surface Wetting Agent

Thixotropic gel that improves final
adhesion for the DFence Blok product.

  • Can be overcoated directly after
  • Non sagging


A 300 micron thick coating of DFense Blok Surface Wetting
Agent will harden at 25ºC in 4-5 hours. The material will be
fully cured in 16 hours. It will continue to cure beneath the
DFence Blok product when applied directly after Surface
Wetting Agent application resulting in maximum performance
after 16 hours.

Proper surface preparation is essential to a successful
application. The following procedures should be considered:
  • All surfaces must be dry, clean and with a suitable profile
    to facilitate bonding to the substrate.
  • If surface is oily or greasy use Devcon Fast Cleaner 2000
    Spray/Cleaner Blend 300 to degrease the surface.
  • Remove any existing paint, rust or other contamination
    from the surface by abrasive blasting or other mechanical
    techniques. Further reference can be made here to the
    Devcon Metal filled user guide.
  • Aluminium repairs: Oxidation of aluminium surfaces will
    reduce the adhesion of an epoxy to a surface.
    This film must be removed before repairing the surface,
    by mechanical means such as grit-blasting, abrading or
    chemical means.
  • Provide a “profile” on the metal surface by roughening the
    surface. This should be done ideally by grit blasting (8-40
    mesh grit), or by grinding with a coarse wheel or abrasive
    disc pad. An abrasive disc may be used provided white
    metal is revealed. Do not ’feather edge’ epoxy materials.
    Epoxy material must be ’locked in’ by defined edges and
    a good 3-5 mil profile.
  • Metal that has been handling sea water or other salt
    solutions should be grit blasted and high pressure water
    blasted and left overnight to allow any salts in the metal
    to ’sweat’ to the surface. Repeat blasting may be required
    to ’sweat out’ all the soluble salts. A test for chloride
    contamination should be performed prior to any epoxy
    application. The maximum soluble salts left on the substrate
    should be no more than 40 ppm (parts per million).
  • Chemical cleaning with Devcon Fast Cleaner 2000 Spray/
    Cleaner Blend 300 should follow all abrasive preparation.
    This will help to remove all traces of sandblasting, grit, oil,
    grease, dust or other foreign substances.
  • Under cold working conditions, heating the repair area
    to 38º-43º C immediately before applying any of Devcon
    Epoxies is recommended. This procedure dries off any
    moisture, contamination or solvents and assists the
    epoxy in achieving maximum adhesion to the substrate.
  • Always try to make the repair as soon as possible after
    cleaning the substrate, to avoid oxidation or flash rusting.
    If this is not practical, a general application of FL-10 Primer
    will keep metal surfaces from flash rusting.

Add the hardener to the resin then mix thoroughly using a
suitable mixing paddle or suitable size jiffy type mixer. Mix in
such a fashion that the material is thoroughly dispersed until

Spread the material over the prepared surface with a putty
knife, spatula or stiff brush pressing firmly into all cracks
and voids to ensure maximum surface contact and avoid
trapping air. A film of at least 300 microns is recommended
and application to vertical and overhead surfaces is possible
without dripping.
Either directly after application or within 45 minutes, depending
on temperature, the DFence Blok should be applied. If this
window is exceeded and the Surface Wetting Agent has
become firm then a further coat should be applied prior to the
DFence Blok.

A shelf life of 3 years from date of manufacture can be
expected when stored at room temperature (22ºC) in their
original containers.

For complete safety and handling information, please refer
to Material Safety Data Sheets (MSDS) prior to using this

ITW Performance Polymers will replace any material found to
be defective. As storage, handling and application of this
material is beyond our control we can accept no liability
for the results obtained.

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