SEMI-GLOSS TWO COMPONENT

POLYURETHANE TOPCOAT

Suggested Uses

• Steel
• Aluminum (vinyl wash primer or AGA 2000 required)
• Fiberglass
• Wood
• Masonry
• Concrete

Technical Data

Coating type	Two component aliphatic polyurethane
Colour	Wide range of colors / Color matching services
Packaging	2.84L (1US gallon)
Mixing Ratio	3 : 1 per volume
Gloss (ASTM D523)	Semi-gloss
Flashpoint (ASTM D93)	26º C (79º F)
Induction time	None
Thinner	UC 500S - Regular
Pot life	6 hours
Shelf life	4 years
Density (ASTM D 1475)	1.40 kg / L +/- 0.05

Weight	11.65 +/- 0.11 lbs / US gal.
Volatile organic compound (VOC)	4.0 lb / US gal. (480 g/L)
Temperature resistance	100º C (212º F) in continuous service
Solids (ASTM D1644)
By weight	65+/- 2%
By volume	45+/- 2%
Theoretical spreading rate	17.5 sq.m /l at 25 microns dry 725 sq.ft. / US gal at 1 mil
Recommended film thickness	50 - 75 microns dry (2.0 - 3.0 dry mils)
Application methods	Air spray, airless, brush or roller

Surface Preparation

Subtrate must be clean, dry and free from any contaminants. Remove dust, grease, wax, oil, rust, silicone residue, etc. Remove all old paints in order to obtain adequate adhesion. In doubt, contact technical services at 1-800-361-6652 for proper guidance in preparing substrate.

Mixing and Thinning

GLASS-GUARD™ 2850 is a two component product supplied in 5 US gallons or 1 US gallon containers which contain the proper ratio of ingredients. The entire content of each container must be mixed together or mix only what is needed. Power mix the base portion first to obtain a smooth, homogeneous product. Thoroughly mix 3 parts by volume of polyurethane Part A. Add one (1) part by volume of catalyst Part B (GS 275-55C) while mixing. Product is now ready to be applied. Mix only what is needed for use in that time. Pot life is 6 hours at 20ºC.

However, at low temperatures small amounts (less than 10% by volume) of GS UC 500S may be added. In airspray application add thinner in order to obtain adequate spraying viscosity (10 to 15% or more of GS UC 500S).

Warning: Excessive solvent addition can adversely affect the performance of the coating.

Application Conditions

Industry standards are for the substrate temperatures to be above 10º C of the dew point. Condensation due to substrate temperatures below the dew point can cause flash rusting on prepared steel and interfere with proper adhesion to the substrate.

Special application techniques may be required above or below normal application conditions.

Condition	Material	Surface	Ambient	Humidity
Normal	60 - 85º F (16 - 29º C)	60 - 85º F (16 - 29º C)	60 - 90º F (16 - 32º C)	0 - 65%
Minimum	50º F (10º C)	50º F (10º C)	50º F (10º C)	0%
Maximum	90º F (32º C)	100º F (35.5º C)	100º F (35.5º C)	85%

DISCLAIMER: All information is given in good faith. Since conditions of use are beyond the manufacturer's controls, all information contained herein is without warranty, implied or otherwise. All technical data and specifications are subject to change. Please consult with your Glass Shield representative for more detailed coating recommendations. Revised 08-01-2007

Typical Sequence (First class finish)

Application

GLASS-GUARD™ 2850 can be applied by air spray, airless roller or brush. Air spray and airless is recommended. For conventional spray De Vilbiss MBV or equivalent equipment fitted with 765 Cap, "E" tip and needle. For airless spray equipment capable of maintaining a minimum 1500 psi pressure at tip with 0.013 inch (0.33 mm) - 0.015 inch (0.38 mm) orifice. For HVLP applications, please consult and follow equipment supplier's instructions.

All spray equipment and fluid lines must be clean and free of moisture or solvents. Do not apply to damp surfaces or under high humidity conditions since condensation or fog could settle on the coating before it has cured.

Minimum temperature for application : 10ºC or 50ºF. Temperatures over 30ºC or high humidity conditions may shorten the drying time or the pot life.

Airless & Air Spray

Manufacturer	Graco
Pump	30 : 1
Fluid hose	3/8" x 100' max
Tip size	309 / 411 / 513/ or equivalent
PSI	2400 PSI min.

Manufacturer	Devilbiss	SATA
Spray gun	HET	K3 RP
Fluid tip	1.1 ff	1.1
Air cap	#410 / 414
Fluid line	3/8"	3/8"
Pressure pot	15 - 25 psi	40 psi
Atomizing air	50 - 60 psi	36 psi

Curing Schedule

Ventilate the substrate for 2 hours after application. Curing times are based on a 2.0-3.0 mil (50-75 micron) dry film thickness. Higher film thickness, insufficient ventilation or cooler temperatures will require longer cure times and could result in solvent entrapment and premature failure of the film. Maximum recoat time is 72 hours without special surface preparation. Consult technical services for recommendations and test results. If the maximum recoat time has been exceeded, the surface must be sanded or prepared with a brush off blast SSPC-SP-7 prior to the application of additional coats. GLASS-GUARD™ 2850 applied below 40ºF (4ºC) may temporarily soften for several hours, after temperatures rise to 60ºF (16ºC). This is a normal condition and will not influence performance.

Dry to touch	40 minutes
To recoat	3-6 hours
Hard	8 hours
Full cure	7 days