Page 9 - Polycoat 1.1 Table of Contents

SECTION 1.3
GENERAL GUIDELINES

an undiluted basis. No allowances have been made for material dry until tack free and sufficiently cured for foot traffic before
waste, uneven surfaces, spillage, material applied thicker than applying additional polyurethane coating. A period less than
specified, or material left in containers or equipment. one hour to overnight may be required depending on drying
conditions and the particular product used.
MIXING
Important: All products must be mixed according to the For a more slip-resistant surface, uniformly broadcast a
Technical Data Sheets prior to use. washed, dry, rounded 16 to 90 mesh (0.0065-1.19 cm) silica
sand into the wet topcoat at a rate at a rate of 20 lbs/100 sqft
Mix two component materials individually before combining. (1kg/sqm) or as required to achieve a slip-resistant finish.
Stir all materials thoroughly before use. Examine both Slip resistance will vary depending on the coating thickness.
Side-A and Side-B for graininess. Partial containers should
not be stored longer than one or two days as exposure to Extend each coat over cants and up vertical surfaces of pads,
atmospheric moisture induces cure. Keep containers covered curbs, walls and parapets. The top of curbs and equipment
whenever possible. pads shall be similarly coated. In the case of walls and parapets,
extend coating to the point where counter flashings enter the
For best results, power mix thoroughly for five minutes, masonry. Where no counter flashing is specified, hold the base
scraping sides of container. Best results are obtained by coats just short of the termination line at the edge of the deck
pouring Side-B into Side-A while mixing. Polyethylene or to avoid seeping under masking tape or spilling on adjacent
polypropylene mixing containers are recommended, as they unprotected surfaces.
can be reused. Cured material is easily stripped out cleanly
the following day. If the entire job cannot be carried through to completion
without interruption, the interruption should occur after the
If the product requires a catalyst, the best results will be first coat. This will provide protection for the system.
obtained by pouring the catalyst into the product while mixing.
Coated surfaces must be clean and dry before work resumes.
Mix only as much material as can be used within the specified
pot life. APPLICATION OF TOPCOAT
Inspect the surface for damage prior to the application of
COLD WEATHER APPLICATION topcoat. Any surface damage must be re paired by replacing
During cold weather, special precautions must be taken in base coat so that a continuous membrane in substantially
applying polyurethanes. These coatings should not be applied uniform thickness covers the entire surface prior to topcoat
to surfaces 50°F (10°C) or colder. Store materials above 65°F application.
(18°F), or warm to above 65°F (18°C) prior to use. Surfaces
temperature should be 5°F (3°C) above dew point temperature. While careful color matching procedures are used, different
batches of polyurethane may vary slightly in hue. This variation
If graininess is observed, warm the entire contents of the can will be too slight to be perceptible if changes are made at
to 60°F (16°C), and mix until smooth.
natural breaks in the surface. Intermixing of batches may be
Lower temperature and humidity may extend curing time. necessary or desirable to ensure consistency in topcoat color.
HOT WEATHER APPLICATION CAUTION
Product data on pot life and cure rate are provided for materials Excessively heavy applications of polyurethane can cause
at 75°F (24°C). At temperatures above 75°F (24°C) pot life and blistering, pinhole or pigment separation during drying,
cure time will decrease propor tionately as temperature and resulting in a blotched color. Uniform application at the
humidity increase. Store materials out of direct sunlight and specified coverage rate is important to provide proper results.
mix only the amount that can be applied within the pot life. Remove masking tape at edges of coating area as soon as
Refer to product data sheets for further information.
the final coat of polyurethane is applied. By removing the
APPLICATION OF BASECOAT tape while the coating is wet, it will not be necessary to cut
All specified quantities are on an undiluted basis. Better films it off and will avoid damage to the edge of the coating. Any
are usually produced with less entrapped air when the rate of seepage under the tape on rough surfaces can be wiped off
application is no more than 1 1/2 gallons/100 sqft (0.3 liters/ with thinner while wet.
sqm) or 66 gallons/100 sqft. However, the recommended rate The following conditions must not be coated with Polycoat
varies by product and specification. Products deck coating systems: on grade slabs, split slabs
Apply Polycoat Products polyurethane in a uniform thickness with buried membrane, sandwich slabs with insulation, slabs
without skips or holidays. Basecoats can be squeegeed or over unvented metal pan.
rolled, depending on job type and size. Allow each coat to

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