1 APPLICATION GUIDE &. MOISTURE CURE URETHANE. RECOMMNDATIONS. APPLICATION GUIDE . & RECOMMENDATIONS. FOR. FOR CONCRETE SURFACES. PRODUCT STORAGE Follow recommendations in Section , AND HANDLING but increase agitation time. All Wasser MC-Urethanes should be Do not subject Wasser MC-Urethanes to stored in a covered shelter. Care should agitation during APPLICATION . Once be taken to ensure that unused containers thoroughly mixed, the pigments will stay in remain sealed and leftover, partial suspension for up to 4 hours. Continuous containers are properly resealed. agitation can cause premature gelling. Storage temperature can range from 40 F. Thinning: Use only MC-Thinner or MC- to 100 F and should be kept constant. Thinner 100. Make no exceptions, The material temperature must be brought substitutes, or assumptions about using to 5 F above the dew point temperature other reducers.
2 Most industrial solvents before opening and agitating the material contain water, or alcohol. Even a very to prevent condensation from entering the small amount of water, alcohol or other coating. hydroxyl bearing solvent can contaminate Since Wasser MC-Urethanes react with and destroy the MOISTURE -cure reaction atmospheric MOISTURE , it is important to without any apparent indication or gelling. limit the time the container is open. Mix Substitutions may also jeopardize and pour out only what is needed, then APPLICATION and performance properties apply a solvent float of approximately 3 - and will void any product warranty. 6 ounces of Wasser's thinner over the Consult Wasser Technical Service for surface of the coating before resealing the thinning recommendations when Wasser's container. thinner is not available.
3 If it is not possible or practical to reseal the CONCRETE CURE TIMES. container during spray APPLICATION , pour a Wasser solvent float over the coating to ASTM C150 concrete types will vary in prevent MOISTURE intrusion. rate of cure. Wasser recommends a minimum cure of 7 days for non-immersion If a skin forms on the surface of the service and 14 days for immersion service. coating in a new, sealed container or a Test the concrete for MOISTURE content resealed partial container, remove it by using mechanical or digital methods. cutting the edge of the skin at the Proceed with surface preparation and skin/container interface, and discard. coating APPLICATION when the MOISTURE Agitate the remaining material until it's content of the concrete is not in excess of homogeneous, adding Wasser's thinner as 14%. necessary.
4 Filter the coating through a fine filter and proceed with the APPLICATION . ASTM D4263-83: The plastic sheet method is used to indicate the presence of MIXING AND THINNING capillary MOISTURE in concrete. Tape 18 . by 18 (457 by 457 mm), 4-mil thick, clear Wasser MC-Urethanes are single- plastic sheet tightly to the surface, making component coatings. There is no mixing sure that all edges are sealed. Keep the Part A with Part B ; however, the coating taped sheet in place for a minimum 16. should be mixed using power agitation for hours, then remove it and visually inspect 3 minutes or until it's completely the underside of the sheet and the homogeneous. concrete for the presence of MOISTURE . Do not use on paint shaker, and avoid repeated boxing. If ASTM D 4263-83 test shows darker (damp, but not visually wet) concrete the Aged Wasser MC-Urethanes (6 months or coatings APPLICATION can commence.)
5 Older) may develop significant settling. APPLICATION GUIDE & Recommendations- Concrete 5/04. Refer to SSPC-TU2, SSPC GUIDE 11 and to SSPC-SP13/NACE No. 6 Surface ACI 308 for additional information. Preparation of Concrete for complete surface preparation procedures prior to PRE-SURFACE PREPARATION protective coating APPLICATION . Consult Any curing agents or hardeners, oil, Wasser for further recommendations grease, dirt and other contaminants must whenever the following SSPC-SP13 NACE. be removed prior to surface preparation No. 6 methods do not meet your project and coating APPLICATION . Various methods requirements. of pre-surface preparation are available as Surface preparation methods should referenced in SSPC-SP13/NACE No. 6 achieve adequate surface profile and and the following ASTM Standards. porosity to ensure optimum mechanical Consult Wasser for further coating adhesion to the substrate.
6 In most recommendations whenever the following cases, the desired profile is similar to that ASTM designations do not meet your of medium grade sandpaper. project requirements. Abrasive Blasting Methods, either wet or ASTM D 4258-83 (Reapproved 1999) dry, can be used to remove contaminants, Standard Practice for Surface Cleaning loose paint, laitance, and weak concrete, Concrete for Coating: This practice is to expose surface voids and to produce a primarily recommended for light-duty sound concrete surface with adequate service. Where protective coating systems profile and porosity. Vacuum or air blast are used for continuous or intermittent cleaned surface to remove all sand and immersion, mechanical loading and for dust. systems needing optimum bond, this standard should be used as pre-surface High-Pressure Water Cleaning Methods preparation in conjunction with ASTM described in SSPC-SP12/NACE No.
7 5. D4259 and ASTM D4260. using manually operated high-pressure water jetting equipment may be used to ASTM D4259-88 (Reapproved 1999) remove contaminants, loose paint, Standard Practice for Abrading Concrete: laitance, and weak concrete, to expose This practice is intended to alter the surface voids and to produce a sound surface profile of the concrete, remove concrete surface with adequate profile and foreign materials and weak surface porosity. laitance. This standard will effectively remove curing compounds, form release Impact Tool Methods include scarifying, materials, and concrete hardeners. Use planing, scabbling, and rotary peening to this standard in conjunction with ASTM remove existing coatings, laitance, and D4258. weak concrete. Impact-tool methods may fracture concrete surfaces or cause micro- ASTM D4260-88 (Reapproved 1999) cracking that may need supplemental Standard Practice for Acid Etching cleaning with Abrasive Blasting or High Concrete: This practice is primarily used Pressure Water Cleaning to produce a on horizontal surfaces, and is intended to sound concrete surface with adequate alter the surface profile of the concrete.
8 It profile and surface porosity. The aids in removing foreign materials and soundness of an impact-tool prepared weak surface laitance but is not effective in surface should be verified by testing the removing curing compounds, form release surface tensile strength after cleaning. agents and hardeners. Use this standard in conjunction with ASTM D4258. Power-tool Methods include circular grinding, sanding, and wire brushing to If a concrete floor is below grade, a remove existing coatings, laitance, MOISTURE barrier should be present under protrusions, loose paint and weak the slab. This eliminates the possibility of concrete. These methods may require hydrostatic pressure build-up under the Abrasive Blasting or High-Pressure Water coating, which can cause blisters and Cleaning to produce a sound concrete delamination.
9 Surface with adequate profile and surface porosity. SURFACE PREPARATION Chemical Surface Preparation or Acid Follow Pre-Surface Preparation Etching as described in ASTM D4260 may recommendations in Section , and refer be used on horizontal surfaces to remove APPLICATION GUIDE & Recommendations- Concrete 5/04. some surface contaminants, laitance, and condensate. Never allow old thinner in the weak concrete, and may provide sufficient paint lines to enter the coating. surface profile on concrete. This method Stage 5-gallon pails away from paint pump requires the complete removal of all to prevent relief valve MOISTURE from reaction products and pH testing to ensure contaminating the product. Line a clean, neutralization of the acid. Acid etching is empty pail with a 55-mesh screen, and not recommended on vertical surfaces or tape the screen to the outside of the pail.
10 On areas where curing compounds and Cut a 3 slit parallel to the pail top, to allow sealers have been used. Acid etching with insertion of a siphon unit, placing it hydrochloric acid is not for use where between the screen and pail wall. This corrosion of metal in the concrete is likely measure minimizes potential plugging of to occur. the spray tips. Inspect the surface for soundness, Follow all mixing instructions, apply a MOISTURE content, and cleanliness. Ensure Wasser solvent float , and place a cover all contaminants, form release agents, and over the pail. hardeners are removed. Repair or remove any surface irregularities and loose All Wasser MC-Urethanes are supplied concrete. Use an approved crack filler on ready to mix and spray. Use standard holes and cracks. When the surface is production type spray equipment.