ZINC / ALUMINUM/ MICACEOUS IRON OXIDE (M.I.O)

MOISTURE CURED URETHANE PRIMER

Suggested Uses

• Pulp & Paper mills
• Refineries
• Pipelines
• Chemical reservoirs and storage tanks
• Trucks and fleets
• Railcars
• Any steel structures exposed to corrosive elements

Technical Data

Coating type	Single component moisture cure urethane
Colour	aluminum grey
Packaging	3.78 L (1 US gallon) 18.9 L (5 US gallon)
Mixing Ratio	Single component
Gloss	Flat
Flashpoint (ASTM D93)	26º C (80º F)
Thinner	GS UC 500S
Pot life	4 to 6 hours
Shelf life	2 years
Density (ASTM D 1475)	1.60 kg / L +/- 0.05
Weight	15.30 +/- 0.11 lb / US gal.
Volatile organic compound (VOC)	3.0 lb / US gal. (360 g/L)

Temperature resistance	100º C (212º F) in continuous service
Solids (ASTM D1644)
By weight	75 +/- 2%
By volume	55 +/- 2%
Theoretical spreading rate	22 sq.m / l at 25 microns dry 900 sq.ft. / US gal at 1 mil
Recommended film thickness	50-100 microns dry (2.0 - 4.0 dry mils) For severe conditions: 100-200 microns dry (4.0-8.0 dry mils)
Application methods	Conventional air spray, airless and HVLP (airless preferred)

Surface Preparation

All heavy duty corrosion control coating systems provide the maximum performance over white or near white blasted surfaces (SSPC-SP-5 or SSPC-SP-10). There are, however, structures where it is not possible to obtain this ideal surface condition. The surface preparation recommended for PRIME-SHIELD™ MC-4390 is to include removal of all oil, grease, dirt, dust, mill scale, sealing rust, paint and other foreign matters. This can be accomplished with hydroblasting, grit sweeping and with a variety of mechanical descaling tools. The minimum standard for steel is Steel Structures Painting Council Standard SSPC-SP-2 or SSPC-SP-3. The typical recommended surface preparation for that product is SSPC-SP-6.

Mixing and Thinning

PRIME-SHIELD™ MC-4390 is a single component product supplied in 5 US gallons or 1 US gallon container. The entire content must be well stirred before application.

Thinning is normally required at 10% to 20% with Glass Shield UC- 500S thinner.

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 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)	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

Typical Sequence (First class finish)

Not recommended for

• Non metallic surfaces

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

Performance Information

Specific Test	ASTM	Result
Impact resistance: direct	D2794	76 lbs
Elcometer (pull test)	D4541	> 800 lbs with polyurethane 2800 series

Salt Spray

Specific Test	ASTM	Result
System MC-4390 + polyurethane 2800*	B117	5000 hours

*All results based on Glass-Guard 2800002 white

Chemical Resistance (spot tests)

Specific Test	ASTM	Result
Solvent	D1308	Very good
Acids	D1308	Very good
Alkali	D1308	Very good
Oil / grease	D1308	Very good
Detergent	D1308	Excellent

Application

PRIME-SHIELD™ MC-4390 can be applied by spray. De Vilbiss or equilavent equipment should be used. Airless spray: heavy duty 30:1 airless pump with tip size 0.011-0.021 in. at 3000 psi pressure with 3/8 fluid hose maximum 50ft lenght. For HVLP applications, please refer and comply with equipment supplier's recommendations.

Curing times given at 23ºC (73ºF) and 40% relative humidity. Higher or lower temperatures will affect drying times.

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 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 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. PRIME-SHIELD™ MC-4390 applied below 40ºF (4º C) may temporarily soften for several hours, after temperatures rise to 60ºF (16º C). This is a normal condition and will not influence performance.

Dry to touch	1 hour
To recoat	Overnight (Max. 5 days before sanding)
Hard	6 hours
Full cure	7 days