Surface must be clean, sound and dry. Remove dust,
laitance, grease, curing compounds, bond inhibiting
impregnations, waxes and any other contaminants.
All projections, rough spots, etc. should be removed to
achieve a level surface prior to the application.
Concrete should be cleaned and prepared to achieve
a laitance-free and contaminant-free, open textured
surface by shot blasting or equivalent mechanical
means (CSP-3 to CSP-4 as per ICRI guidelines).
Sweep and vacuum any remaining dirt and dust with a
wet/dry vacuum. Removing residual dust will help
ensure a tenacious bond between the primer/ coating
and the substrate. Whenever “shot-blasting” is utilized,
be careful to leave concrete with a uniform texture.
“Over-blasting” will result in reduced coverage rates of
the primer and/or subsequent topcoats.
The “shotblast” pattern may show through the last
coat, known as “tracking”. The compressive strength
of the concrete substrate should be at least 3626 psi
(25 MPa) with a minimum pull off strength of 218 psi
(1.5 MPa) in tension at the time of application.
For other substrates, please contact Sikafloor
Technical Services.
