Super-adhesion, penetrating material used as a primer/sealer over concrete pavers, acid stains and a variety of architectural concrete surfaces.
Polyurethane 250 Clear High Performance Coating: Features and Usage
Polyurethane 250 is a two component, low viscosity acrylic urethane. It is used as a primer/sealer over a variety of surfaces. The use of special solvents and adhesion promoters gives this material excellent penetration and adhesion to minimally profiled concrete. Polyurethane 250 is U.V. stable for use in exterior applications, cures rapidly and is easily recoated with both solvent-based and water-based polyurethanes. When used as a finish coat, this material gives a hard, high gloss surface that offers excellent stain resistance and easy cleanability. Compared to solvent-based acrylic sealers, Polyurethane 250 offers substantial improvements in initial gloss, gloss retention and overall performance. Polyurethane 250 is available in a satin finish if a lower gloss is desired. A special version of this material is available to meet the 50 grams/liter VOC limit in California.
Polyurethane 250 has been designed for use over concrete, acid stained surfaces, and various types of architectural concrete. Its performance as a paver sealer is unexcelled. It is especially suitable over acid stained concrete because it is unaffected by pH drifts that can affect the adhesion of other types of primers. When used over acid stains or integrally colored concrete, it gives color enhancement similar to solvent acrylic sealers. Polyurethane 250 can also be used as a tie coat over difficult to adhere to surfaces such as polyester urethane. When used as a finish coat in vehicle areas, it resists tire tracking and provides easy soil release. Although abrasion resistance to heavy foot traffic far exceeds single component materials, the best performance in these areas is achieved with polyester urethanes such as Polyurethane 100, Polyurethane 100 VOC or Polyurethane 501.
Acrylic oligomer crosslinked with aliphatic isocyanate. System modified with U.V. absorbers, hindered amine light stabilizers and a proprietary adhesion promoter.
- Use over dense, minimally profiled surfaces requires machine scrubbing with a nylogrit type brush.
- Do not use solvent acrylic as a primer for Polyurethane 250.
- Applications heavier than 200 sq. ft. per gallon or puddling may result in solvent entrapment and possible blistering.
- Do not use the satin material over an unprimed surface.