LOW VOC / COAL TAR

MOISTURE CURE URETHANE
DISCONTINUED

Suggested Uses

• Steel used in partial or total immersion
• Heavy trucks and trailers
• Special vehicles for the highway maintenance
• Road transport industry
• Railway industry
• To use as a final coat. Do not recover.

Technical Data

Coating type	Single component moisture cure urethane
Colour	black
Packaging	3.78 L (1 US gallon) 18.9L (3 gallons)
Mixing Ratio	Single component
Gloss	Semi-gloss / mat
Flashpoint (ASTM D93)	41º C (106º F)
Thinner	GS UC 500S
Pot life	up to 6 hours
Shelf life	1 year
Density (ASTM D 1475)	1.10 kg / L +/- 0.05
Weight	9.15 +/- 0.11 lb / US gal.

Volatile organic compound (VOC)	1.7 lb / US gal. (206 g/L)
Temperature resistance	100º C (212º F) in continuous service
Solids (ASTM D1644)
By weight	80 +/- 2%
By volume	76 +/- 2%
Theoretical spreading rate	30 sq.m / l at 25 microns dry 1224 sq.ft. / US gal. at 1 mil
Recommended film thickness	150-200 microns dry (6.0 - 8.0 dry mils)
Application methods	Brush, roller, conventional air spray, airless and HVLP (airless preferred)

Surface Preparation

The surface preparation recommended for PRIME-TAR™ MC 46750 is to include removal of all oil, grease, dirt, dust, mill scale, rust, paint, corrosion product and other foreign matters. This can be accomplished with hydroblasting, grit sweeping and with a variety of mechanical descaling tools. The minimum standard for non-immersion service is Steel Structures Painting Council Standard SSPC-SP-10 (near-white blast cleaning). For a heavy duty corrosion control system, the recommended surface preparation for immersion and non-immersion service is or SSPC-SP-10 primed with Glass Shield's Zinc-Shield moisture cure primer.

Mixing and Thinning

PRIME-TAR™ MC 46750 is a one component product supplied in 3 US gallons or 1 US gallon containers. The entire content of the container must be well mixed before application

Thinning is not normally required or desired; however, at lower temperatures, small amounts (10% or less) of Glass Shield GS UC 500S thinner can be added depending on local VOC and air quality regulations. Any solvent addition should be made after the one component product is thoroughly stirred.

The pot life or the "working pot" is up to 6 hours. After the paint is stirred and poured, immediately seal the original can. Higher temperatures or humidity will shorten the pot life. Do not apply over water or frozen surfaces.

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 fl ash 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)	65 - 85º F (18 - 29º C)	p>60 - 90º F (16 - 32º C)	0 - 65%
Minimum	50º F (10º C)	23º F (5º C)	23º F (5º 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

Packaging, Handling & Storage

Shipping weight (approximate)	1 gallon: 15.3 lb (7kg)	5 gallons: 76.5 lb (35 kg)
Storage (general)	Store indoors
Storage temperature & humidity	40-100º F (4-43º C) 0-100% relative humidity
Shelf life	Min. 1 year at 75º F (24º C)

Typical Sequence (First class finish)

Not recommended for

• Non ferrous substrates
• Constant immersion

Performance Information

Specific Test	ASTM	Result
Impact resistance: direct	N/A	N/A
Sag (ready to spray)	N/A	N/A
Viscosity	N/A	N/A
Intercoat adhesion	N/A	N/A
Elcometer (pull test)	N/A	N/A

Salt Spray

Specific Test	ASTM	Result
System MC-46750 + polyurethane 2800*	N/A	N/A

*All results based on Glass-Guard 2800002 white

Chemical Resistance (spot tests)

Specific Test	ASTM	Result
Solvent	N/A	N/A
Acids	N/A	N/A
Alkali	N/A	N/A
Oil / grease	N/A	N/A
Detergent	N/A	N/A

Application

PRIME-TAR™ MC 46750 can be applied by brush, roller or spray. De Vilbiss or equilavent equipment should be used. Airless spray: heavy duty 30:1 airless pump with tip size 0.017-0.021 in. at 3000 psi pressure with 3/8 in fl uid hose maximum 50 ft lenght. Spray gun: similar to De Vilbiss 510, fl uid tip 0.55-0.73 in. at 30-60 psi pressure. For HVLP applications, please refer and comply with equipment supplier's recommendations.

Airless & Air Spray

Manufacturer	Graco
Pump	30 : 1
Fluid hose	3/8" x 100' max
Tip size	*
PSI	2400 PSI min.

Refer to Kremlin chart for specific uses or consult Glass Shield technical services

Manufacturer	Devilbiss	SATA
Spray gun	HET	K3 RP
Fluid tip	1.4-1.6 ff	1.4-1.6
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 fi lm thickness. Higher fi lm thickness, insuffi cient ventilation or cooler temperatures will require longer cure times and could result in solvent entrapment and premature failure of the fi lm. Maximum recoat time is 5 days without special surface preparation. If you desire a longer recoat window, an additive can be added. Consult a Glass Shield representative for further information. If the maximum recoat time has been exceeded, the surface must be sanded or prepared with a brush off blast SSPCSP- 7 prior to the application of additional coats. INTER-SHIELD™ MC 46750 applied below 40ºF (4ºC) may temporarily soften for several hours, after temperatures rise to 60ºF (16º C). This is a normal condition and will not infl uence performance. Curing times given at 23ºC (73ºF) and 40% relative humidity. Higher or lower temperatures will affect drying times.

Dry to touch	4 hours
Hard	12 hours
Full cure	7 days