ELASTUFF 120 100% Solids Polyurethane Coating A protective surface coating that yields a tight, dense finish against wear, abrasion and corrosion in aqueous as well as dry environments.

Description
ELASTUFF 120 is a two component, 100% solids polyurethane elastomer coating containing no mocha or fillers such as clay or mica. It was formulated for protecting surfaces subject to traffic and abrasion, and for protecting them from all aqueous environments, including fresh water, salt water, slurry systems, and numerous acid and base solutions. It is equally effective under dry abrasive and/or damp corrosive environments.

ELASTUFF 120 is a highly cross-linked polymer coating, yielding a dense, tight finish. Its nonporous surface and excellent hydrolytic stability make ELASTUFF 120 an excellent barrier to wear and corrosion. The high tensile strength of ELASTUFF 120 contributes to its resistance to abrasion and tearing. This toughness, combined with its elongation properties, also results in outstanding flexibility and impact resistance. ELASTUFF 120 is a solventless system enabling fast, high-build coats without solvent entrapment. We supply it in a roller-grade version.

Basic Uses
ELASTUFF 120 is used over a wide variety of vertical and horizontal wood, fiberglass, concrete, steel, iron and polyurethane foam surfaces.

Typical applications include wood decks (boat and home), wood boat hulls, fiberglass deck and hull surfaces, wood/ concrete/steel steps, walkways, lanais, swimming pools, pool decks, tennis courts, parking areas, garage floors, concrete top surfaces, pipe interiors, steel floors.

The vertical hold attained by ELASTUFF 120 gives it the ability to uniformly cover coarse or pitted wood and concrete, as well as weld seams, bolts, angles and edges, and other irregular surfaces.

Color
Flint Gray

(Part A is black; Part B is white. Combined mix is Flint Gray.)

Surface Preparation

All surfaces should be dry and clean, free from any dirt, grease, oil, pollution fallout, smoke, wax, form release agents, surface chemicals, or other foreign contaminants which could interfere with proper adhesion. Surfaces should be free of sharp projections, ridges and loose aggregate.

Wood: ELASTUFF 120 can be applied directly to clean new wood. To additionally protect the wood, one or more coats of CPES™ (Clear Penetrating Epoxy Sealer) can be applied first, including all seams and edges, and allowed to cure. All cracks larger than hairline should be considered as "moving" and be cleaned and filled with either Fill It™ Epoxy Filler or Dymonic® FC or Sonolastic® ULTRA polyurethane sealants. Sealants should be troweled flush with sufficient pressure to fill the cracks and joints completely. At least 2 generous coatings of ELASTUFF 120 are required on top of the primed or unprimed surface. Each additional coat should be applied perpendicular to the original coating.

Old wood or restored wood should be clean and bare and free of any foreign contaminants. We strongly recommend a prime coating of CPES™ (Clear Penetrating Epoxy Sealer) if the wood shows any signs of deterioration, softness or rot. After the sealer has completely dried/cured, existing hairline cracks should be filled with Fill It™ Epoxy Filler or Dymonic® FC or Sonolastic® ULTRA polyurethane sealants. Sealants should be troweled flush with sufficient pressure to fill the cracks and joints completely. At least 2 generous coatings of ELASTUFF 120 are required on top of the primed surface. Each additional coat should be applied perpendicular to the original coating.

Fiberglass: Fiberglass should be scuffed and cleaned with M.E.K. before ELASTUFF 120 is applied. The surface should be primed with CPES™ (Clear Penetrating Epoxy Sealer). At least 24 hours should pass between the application of the primer and the application of ELASTUFF 120. At least 2 generous coatings of ELASTUFF 120 are required on top of the primed surface. Each additional coat should be applied perpendicular to the original coating.

Concrete: Concrete which will be subject to immersion conditions must be blast cleaned. Concrete subject to non-immersion conditions can either be blast cleaned to roughen the surface or acid etched, so long as the etching provides an even profile of 5 to 8 mils. The surface preparation must remove all loose, weak or powdery concrete to expose all voids and provide the necessary profile for mechanical adhesion of the ELASTUFF 120.

Concrete surfaces which are contaminated with oil, grease, dirt, chemicals, etc. should be cleaned prior to blasting or acid etching with a biodegradable chemical cleaner and water. Cleaning should be accomplished using mechanical scrubbers and/or high pressure power washing equipment. Rinse thoroughly to remove all traces of the cleaner.

Acid etching should be done with a 10% Muriatic acid solution. The solution should be sprinkled onto the concrete surface. After the solution has stopped bubbling or foaming (normally 5 to 10 minutes) the area should be scrubbed thoroughly by hand or by using mechanical scrubbers. After scrubbing, all surfaces should be thoroughly rinsed with liberal amounts of fresh water to assure complete acid removal. Surfaces may require additional rinsing or a high pressure rinse to remove all traces of the acid solution.

Any resurfacing or repairs necessary to achieve a sound, consistent surface, free of bugholes, voids, cracks or spalling shall be completed prior to priming. After repairs are completed and adequately cured, concrete surfaces should be primed with one (1) coat of CPES™ (Clear Penetrating Epoxy Sealer) or UNISEAL epoxy sealer. Sealer shall be applied by roller, brush or airless spray at the rate of 250 sq. ft. per gallon (6 sq. meters/liter). Allow a minimum of 1 hour dry time at 75°F (24°C) between application of CPES™ or UNISEAL and the application of ELASTUFF 120. Colder temperatures will require additional dry time. The sealed surface should be topcoated within 24 hours and should under no circumstances be left exposed longer than 48 hours.

Steel: Steel must be free of excessive rust scale, pollution fallout, dirt, grease, surface chemicals or other foreign contaminants prior to blast cleaning. Steel surfaces subject to immersion conditions must be blast cleaned to White Metal (SSPC-SP5) with a minimum anchor profile of 2+ mils. Steel subject to non-immersion conditions shall be cleaned to Near-White (SSPC-SP5) with a minimum anchor profile of 2 mils. The proper profile is required to assure optimum adhesion of the ELASTUFF 120 coating system.

Steel surfaces should be primed immediately after blast cleaning with Primer 302 (available by special order) to a thickness of 1.0 to 1.5 dry mils, depending on surface profile. Allow a minimum of 30 minutes dry time at 75°F (24°C) between application of Primer 302 and the application of ELASTUFF 120. Primed areas should be topcoated within 48 hours, although the Primer 302 does have an extended open time.

Coverage
On horizontal surfaces, apply ELASTUFF 120 by pouring an "S" pattern across a 3' to 6' (9 to 18 dm) section of the substrate, then spread evenly to the desired thickness using a roller, squeegee, trowel or brush. It can also be applied directly with a brush, like thick paint. On vertical surfaces, a long nap roller is most effective, although again a brush can be used. On vertical surfaces the coats must be thinner to avoid coating sag. We suggest you cover a small test section first to become familiar with the coverage rate.

ELASTUFF 120 applied at the coverage rate of one gallon per 100 sq. ft. (2.5 sq. meters/liter) of the combined Part A and Part B will theoretically yield 15.0 dry mils (406 dry microns)*. The following dry mil thicknesses* are provided for guideline use only for typical applications:

*The theoretical mil thickness given for coverage per gallon is based on smooth, nonporous surfaces. Actual gallons required to achieve the minimum dry mil film thickness will depend upon the surface texture, ambient weather conditions and technique of the applicator.

• Allow each coat of ELASTUFF 120 to dry tack free prior to applying an additional coat. This will require approximately 6 hours at 75°F (24°C).

• All surfaces must be uniformly coated and free of voids, pinholes or blisters. Old wood can produce air bubbles as the ELASTUFF 120 fills internal vacancies in the wood. These can be sanded clean after the ELASTUFF 120 has fully cured and before any topcoating is applied.

• Ambient temperature range for application is from 40°F to 100°F (4°C to 43°C). ELASTUFF 120 may be applied in high humidity conditions up to 90% R.H. In-service temperature limits for dry heat exposure range from 210°F (99°C) to a minimum of -60°F (-51°C).

• At temperatures above 70°F (21°C) ELASTUFF 120 will set quickly if kept in the container after mixing. At higher application temperatures ELASTUFF 120 should be mixed and immediately poured across the surface and spread to the desired thickness. We do not recommend applying ELASTUFF 120 at temperatures above 80°F (27°C). But if you must, we suggest cooling the cans prior to mixing by refrigeration or by immersing the cans in cold water up to (but not over) the rims. At higher temperatures Elastuff is best applied by two people, one to mix and the other to apply. Extra rollers/brushes should be on hand to replace those on which the Elastuff has started to cure.

• A polyester or fiberglass mesh may be embedded into the first coat of ELASTUFF 120 to help cover and reinforce large cracks, seams or voids. (The Rot Doctor™ sells Polyester Seam Tape available for this purpose).

• ELASTUFF 120 is self-flashing at natural termination points such as expansion joints, deck edges, gaps between decking boards, corners, edges, etc.

• ELASTUFF 120 can be diluted up to 15% with M.E.K. if a thinner coating is desired.

Topcoat Application
ELASTUFF 120 is designed as a functional coating system providing a durable, abrasion and chemical resistant waterproof membrane on a wide variety of surfaces and service conditions. It will lose its sheen and may chalk slightly after extended exterior exposure. For this reason, it is recommended that ELASTUFF 120 be topcoated in areas where aesthetics are of prime importance, or when a color other than standard flint gray is desired. UNIFLEX 255 is typically used when service conditions are severe. RHINO TOP can also be used under less severe conditions.

Packing & Mixing
ELASTUFF 120 is a two component coating available in (2) one gallon units and (2) five gallon units (special order for 5 gallon units). Part A component is black, the Part B component is white. Mix each container separately until the material is of uniform consistency. This can be done with a paddle, but a power mixer is quicker and more efficient. Blend equal parts of the Part A and the Part B in a separate container. This will yield the standard flint gray color.

Cleanup
Use MEK or Methylene Chloride.

Shelf Life and Storage
Shelf life of Part A and Part B components in unopened containers is 6 months from date of shipment. Material must be stored at temperatures between 50°F and 100°F (10°C and 38°C). Do not open the containers until ready to use the material.

ELASTUFF 120 components are affected by moisture prior to catalyzation and must be protected from moisture contamination. Keep all containers tightly closed during storage. Unopened containers are factory sealed with an inert gas to prevent contamination. After opening and if all components are not to be used, containers should be tightly sealed to protect components from moisture contamination. Storage under these conditions should not exceed 3 weeks, although this may vary depending on the amount stored and the ambient atmospheric conditions when the containers are closed.

Elastuff 120 is a hazardous product. Check the shipping options on the order form for details on shipping hazardous items. For additional information refer to the Elastuff 120 Material Safety Data Sheet.