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Surface Preparation Some stainless steel alloys are so inert that it is not possible to
In general, coating performance and adhesion are directly achieve a satisfactory bond. An adhesion test is recommended
proportional to surface preparation. Most failures in the prior to starting the project.
performance of surface coatings can be attributed to poor ALUMINUM
surface preparation. Polyurea coatings rely on the structural Aluminum should be blasted with aluminum oxide or sand,
strength of the substrate to which they are applied. All surfaces and not with steel or metal grit. Excessive blasting may
must be free of dust, dirt, oil, grease, rust, corrosion and result in a warped or deformed surface. After blasting, wash
other contaminants. When coating substrates previously aluminum with a commercially available aluminum cleaner.
used, it is important to consider the possibility of substrate Allow to dry, then prime. Contact Polycoat Products for
absorption, which may affect the adhesion of the coating recommended primer.
system, regardless of the surface preparation. Polycoat NEW AND OLD CAST IRON
recognizes the potential for unique substrates from one project Blast with a steel grit and degrease before priming. Old cast
to another. The following information is for general reference. iron is difficult to prepare for a satisfactory bond. It can absorb
For project-specific questions, contact Polycoat. oil and water soluble contaminants that will keep returning
to the surface after the coating system has been applied
NEW AND OLD CONCRETE
Refer to SS PC-SP13/NACE 6, or ICRI 03732: CSP 3-5. New and affect the coating system adhesion. An adhesion test is
concrete must be cured for 28 days prior to product application. recommended prior to starting the project.
Surface must be clean, dry, sound and offer sufficient profile ALL OTHER SURFACES
for product adhesion. Remove all dust, dirt, oil, form release An adhesion test is recommended prior to starting the project.
agents, curing compounds, salts, efflorescence, laitance and Mixing
other foreign matter by shotblasting and/or suitable chemical Polyeuro 7901 may not be diluted under any circumstances.
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means, in accordance with local chemical regulations. Rinse Thoroughly mix Polyeuro 7901 Side-B (Resin side) with air
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thoroughly, to achieve a pH between 8.0 and 11.0. Allow to dry driven power equipment until a homogeneous mixture and
completely. If old concrete has a surface that has deteriorated color is obtained.
to an unacceptably rough surface, Polycoat Products PC-260
or a mixture of Polyprime 21 and sand should be used as a Application
repair agent for cracks, spalls, bug holes and voids. Upon full Both Side-A and Side-B material should be preconditioned at
cure of the repair agent, prime the entire surface intended 80-90°F (27-32°C) before application.
for coating. Polyeuro 7901 should be applied using a plural component,
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CONCRETE SURFACE PREPARATION REFERENCE heated, high pressure 1:1 spray mixing equipment like Graco’s
ASTM D425 8 - Standard practice for cleaning concrete. ASTM Reactor, Glass Craft or other equivalent machine may be used.
D4259 - Standard practice for abrading concrete. ASTM D4260 -
Standard practice for etching concrete. ASTM F1869 - Standard Recommended surface temperature must be at least 5°F (3°C)
test method for measuring moisture vapor emission rate of above the dew point.
concrete. ICRI 03732 - Concrete surface preparation. Both Side-A and Side-B materials should be sprayed at a
WOOD minimum of 2000 psi and at temperatures above 150°F (66°C).
All wood should be clean, dry and free of any knots, splinters, Adequate pressure and temperature should be maintained
oil, grease or other contaminants. Splintered or rough areas at all times.
should be sanded. Knots should be repaired using Polycoat Polyeuro 7901 should be sprayed in smooth, multidirectional
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Products PC-260 with sand. Upon full cure of the repair agent, passes to improve uniform thickness and appearance.
prime the entire surface intended for coating.
STEEL (ATMOSPHERIC AND IMMERSION EXPOSURE) Storage
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Remove all oil, grease, weld spatters and round off any sharp Polyeuro 7901 has a shelf life of one (1) year from date of
edges from surface. Minimum surface preparation is Near manufacture in original, factory-sealed containers when stored
White Metal Blast Cleaning per SSPC-SP10/NACE 2. Optimum indoors at a temperature between 60-95°F (15-35°C).
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surface profile is 3-4 mils. Prime and shoot Polyeuro onto Side-A and Side-B drums are recommended to be stored
any bare metal the same day as it is cleaned to minimize any above 60°F (15°C). Avoid freezing temperatures.
potential flash rusting.
GALVANIZED SURFACES Store drums on wooden pallets to avoid direct contact with
Clean and degrease any contaminated surfaces before the ground. If stored for a long period of time, rotate Side-A
priming. Do not blast galvanized surfaces with an abrasive and Side-B drums regularly.
grit. An adhesion test is recommended prior to starting the Limitations
project. Do not open until ready to use.
FIBERGLASS REINFORCED PLASTIC
The gel coat should be lightly blasted or sanded with 80 grit Warning
sandpaper and cleaned. This product contains Isocyanates and Curative Material.
PLASTIC FOAMS This product is considered Dangerous Goods. DOT regulations classify
Enhanced adhesion is obtained when the foam is mechanically it as:
abraded. When coating polystyrene, do not use a solvent- Side-A: TOXIC LIQUID, organic, N.O.S. (Isophorone Diisocyanate), Class
based primer. 6.1, UN 2810, PG III, TOXIC. Side-B: AMINES, liquid, corrosive, N.O.S
TEXTILES, CANVAS, FABRICS (polyoxypropylenediamine), Class 8, UN 2735, PG III, CORROSIVE
Adhesion to most fabrics, geothermal membranes and textiles
does not require a primer.
STAINLESS STEEL
Stainless steel may be grit blasted and degreased before
priming. Contact Polycoat Products for recommended primer.

POLYCOAT PRODUCTS TEL 562.802.8834 | FAX 562.921.7363
info@polycoatusa.com | www.polycoatusa.com Section 3.3