Page 88 - Industrial Coatings
P. 88
POLYCOAT
PRODUCTS
A Division of American Polymers Corp.
RECOATING SURFACES Defects in taping and flashing must be corrected prior to
Decks to be re-coated should be thoroughly cleaned. When proceeding with base coats.
the area intended for coating has completely dried and is
free of dirt, dust, oil and other contaminants, apply Polyprime. SECTION 5: COATING APPLICATION
All coated surfaces require special attention. A test patch Polycoat Products materials are one or more components,
should be applied to check for bonding. If adhesion is good, liquid applied polyurethanes*. When properly combined and
the surface is smooth, and no lifting occurs, apply coating applied they cure to form tough, high strength elastomeric
as specified. If adhesion to substrate is poor, and lifting membranes. All specified quantities are minimums and are
does occur, remove old coating before new coatings are on an undiluted basis. No allowances have been made for
applied. material waste, uneven surfaces, spillage, material applied
thicker than specified, or material left in containers or equip-
SECTION 4: EXPANSION JOINTS ment.
SEALINGOFCRACKS,CONSTRUCTIONJOINTS,SUBSTRATE MIXING
CHANGES, AND FLASHINGS Important: All products must be mixed according to the prod-
This step, which follows priming and precedes coating, is uct data sheets prior to use.
the most critical stage in the application of Polycoat Prod-
ucts coatings. Success or failure in application of this sys- Mix two component materials individually before combining.
tem depends largely on how they are treated. Stir all materials thoroughly before use. Examine both Part-
A and Part-B for graininess. Partial containers should not be
Working cracks in concrete are joints or cracks which have stored longer than one or two days as exposure to atmo-
moved or will move appreciably, in any or all of the three spheric moisture induces cure. Keep containers covered
dimensions, due to thermal changes or vibration. A crack whenever possible.
which extends at each end to the edge of the surface, to a For best results, power mix thoroughly for five minutes, scrap-
building expansion joint or to another working crack may be ing sides of container. Best results are obtained by pouring
a working crack. A crack with minute broken fragments along Part-B into Part-A while mixing. Polyethylene or polypropy-
the edge is probably a working crack. lene mixing containers are recommended, as they can be
reused. Cured material is easily stripped out cleanly the
CONCRETE following day.
To prepare expansion joints, substrate changes, cracks and
flashings, apply backer rod if necessary then a polyurethane* If the product requires a catalyst, the best results will be
sealant and reinforcement tape, embedded into the seal- obtained by pouring the catalyst into the product while mix-
ant, with a stripe coat centered over the crack. The crack ing.
must be fully sealed. Any cracks over d" shall be routed to
4" x 4" prior to application of sealant and reinforcing tape. Mix only as much material as can be used within the speci-
fied pot life.
SUBSTRATE CHANGES
Use caulking and reinforcement tape, with a stripe coat cen- COLD WEATHER APPLICATION
tered over the crack, backer rod and polyurethane* sealant During cold weather, special precautions must be taken in
as required at changes in substrate material. Reinforce- applying polyurethanes. These coatings should not be ap-
ment tape must be embedded into the sealant. It is also plied to surfaces 50°F (10°C) or colder. Store materials above
required when the substrate changes plane in a valley, or if 65°F (18°F), or warm to above 65°F (18°C) prior to use.
a crack exists at other changes in plane.
If graininess is observed, warm the entire contents of the
JOINTS IN PLYWOOD can to 60°F (16°C), and mix until smooth.
When a joint must be invisible at close range, filling voids
and nail heads is necessary. Any wood-adhering, Lower temperature and humidity may extend curing time.
non-shrinking, firm-setting, non-staining material is satis-
factory. An epoxy/100 mesh sand grout may also be used. HOT WEATHER APPLICATION
Product data on pot life and cure rate are provided for mate-
To prepare plywood joints, flashings and substrate changes, rials at 75°F (24°C). At temperatures above 75°F (24°C) pot
apply a polyurethane* sealant and reinforcement tape em- life and cure time will decrease proportionately as tempera-
bedded into the sealant with a stripe coat centered over ture and humidity increase. Store materials out of direct sun
supported joints on the same plane, supported joints at and mix only the amount that can be applied within the pot
changes in plane, or unsupported joints. life. Refer to product data sheets for further information.
14722 Spring Avenue  Santa Fe Springs, CA 90670-5108 USA  Tel: 562/802-8834  Fax: 562/921-7363  www.polycoatusa.com  Copyright March 2011 Polycoat Products
