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Florida Finishing Industrial Wash Primer Specification
P60-G2 is a fast drying, pretreatment type, 2 package, acid catalyzed vinyl wash coat.

Semi-Transparent Green .... P60G2 / Catalyst Reducer .... R7K44

Specifications:

General: Substrate should be free of grease, oil, dirt, fingerprints, drawing compounds, any contamination, and surface passivation treatments to ensure optimum adhesion and coating performance properties.

Substrates: Untreated Metals: steel, galvanized or zinc coated steel, aluminum, brass, copper, etc. Light sanding/abrading is required for stainless steel. See product limitations.

Testing: Due to the wide variety of substrates, surface preparation methods, application methods, and environments, the customer should test the complete system for adhesion and compatibility prior to full scale application.

Product Limitations:

• Catalyst Reducer R7K44 is the only reducer to be used with Industrial Wash Primer P60G2. It must be reduced 150%. Do not use any other reducer.
• Zinc coated or galvanized steel comes in many forms, therefore, the coating system should be thoroughly checked before final recommendation.
• Do not apply P60G2 over sandblasted metal. This product does not have enough solids to cover the blast profile and to provide suitable protection. • After the addition of R7K44, the primer must be used within 8 hours.
• This should be re coated within 4 hours to avoid contamination with foreign material and for optimum adhesion and performance of the topcoat.
• Certain topcoats do not provide the same degree of inter coat adhesion when they are applied after the wash primer has dried more than 4 hours. Maximum Performance is usually obtained when the primer is top coated between 30 and 60 minutes.
• P60G2 is not intended for use over adequate chemical treatments on steel, galvanized steel, or aluminum. Using P60G2 over these chemical treatments may result in loss of adhesion.
• Sanding or light mechanical abrading of hard, smooth metallic surfaces, such as stainless steel or chrome, improves adhesion.
• Contains chromate
• Does not provide significant corrosion protection.

Gloss Value:

The gloss meter provides a quantifiable way of measuring gloss intensity ensuring consistency of measurement by defining the precise illumination and viewing conditions. The configuration of both illumination source and observation reception angles allows measurement over a small range of the overall reflection angle. The measurement results of a gloss meter are related to the amount of reflected light from a black glass standard with a defined refractive index. The ratio of reflected to incident light for the specimen, compared to the ratio for the gloss standard, is recorded as gloss units (GU).

Measurement angle refers to the angle between the incident and reflected light. Three measurement angles (20°, 60°, and 85°) are specified to cover the majority of industrial coatings applications. The angle is selected based on the anticipated gloss range, as shown in the following table.

Semi-Gloss

Medium Gloss: 10 - 70 GU

Viscosity: (AD-MIXED)

The viscosity of a fluid is a measure of its resistance to gradual deformation by shear stress or tensile stress. For liquids, it corresponds to the informal notion of "thickness". For example, honey has a higher viscosity than water.

Viscosity is due to friction between neighboring parcels of the fluid that are moving at different velocities. When fluid is forced through a tube, the fluid generally moves faster near the axis and very slowly near the walls, therefore some stress (such as a pressure difference between the two ends of the tube) is needed to overcome the friction between layers and keep the fluid moving. For the same velocity pattern, the stress required is proportional to the fluid's viscosity. A liquid's viscosity depends on the size and shape of its particles and the attractions between the particles.

A fluid that has no resistance to shear stress is known as an ideal fluid or inviscid fluid. Zero viscosity is observed only at very low temperatures, in superfluids. Otherwise all fluids have positive viscosity. If the viscosity is very high, for instance in pitch, the fluid will appear to be a solid in the short term. A liquid whose viscosity is less than that of water is sometimes known as a mobile liquid, while a substance with a viscosity substantially greater than water is called a viscous liquid.

In paint industries, viscosity is commonly measured with a Zahn cup, in which the efflux time is determined and given to customers. The efflux time can also be converted to kinematic viscosities (centistoke, cSt) through the conversion equations. A Ford viscosity cup measures the rate of flow of a liquid. This, under ideal conditions, is proportional to the kinematic viscosity.

16-18 Seconds #2 Zahn Cup

A simulation of substances with different viscosities. The substance above has lower viscosity than the substance

 

Theoretical Coverage: (no application loss)

Also known as the "Spreading Rate". Theoretical Coverage uses the total contents of an AD-MIXED coating. (Part A, plus Part B, plus Part C) Including all catalyst and reducer necessary to meet the Manufacturer Mixing Recommendations as specified on the Product Data Sheet.

253-505 Sq Ft/gal @ 0.2 - 0.4 MIL DFT

Per AD-MIXED KIT. 1 Gal. Base and 1.5 Gal of Catalyzed Reducer.

Recommended Dry Film Thickness: (DFT)

Note: Excessive Film Build-up will cause loss of adhesion.

Coating material when dry (after curing) should typically have a thickness of 30–130 µm (0.0012–0.0051 in) when using acrylic resin, epoxy resin, or urethane resin. For silicone resin, the coating thickness recommended by the IPC standards is 50–210 µm (0.0020–0.0083 in).

There are several methods for measurement of conformal coating thickness and they fall into two categories. These categories are wet film and dry film conformal coating measurements

An alternative method to wet film measurement is using a non contact technique using eddy currents. The system works by placing the test head on the surface of the conformal coating, the measurement is almost instantaneous and provides an immediate repeatable result for thickness measurement of conformal coating.

Test coupons are the ideal method for measuring the coating thickness, whether is it spraying or dipping, and can be kept as a physical record of the performance. Apply the coating to the test coupons at the same time as the circuit boards provides a permanent measurement and an accurate guide to the coating thickness.

MILS Dry: 0.2 - 0.4

Dry film Conformal Coating Thickness Measurement

 

Drying:

Drying Time measurements are based on a 0.4 MIL DFT coating with an ambient temperature of 77°F, and a Relative Humidity of 45%. Note: Top Coat MUST be applied with-in 24 hours of Primer application.

Touch, Tack, Re-Coat, Force.

To Touch: 3-10 Minutes
To Tack Free: 10-15 Minutes
To Top Coat: 10-60 Minutes
To Force Dry: 5-10 Minutes at 130°F

Mixing Ratio:

Catalyst Reducer R7K44 is the only reducer to be used with Industrial Wash Primer P60G2. It must be reduced 150%. Do not use any other reducer.

1 PART P60-G2
1½ PARTS R7K44

R7K44 is a Catalyzed Reducer

Pot Life:

All two-part coatings have a "pot-life" or "working time" during which the coating can be used. Usually the pot-life is a matter of a few hours but is also highly temperature dependent. Both water-borne and solvent based coatings have a Pot-Life.

8 Hours

Based on Environmental Conditions of an ambient temperature of 77°F, and a Relative Humidity of 45%

Shelf Life:

The total period of time beginning with the date of manufacture, or date of pack, and terminated by the date by which an item must be used (expiration date) or subjected to inspection, test, or disposal action.

Shelf-life is not to be confused with service-life (defined as, A general term used to quantify the average or standard life expectancy of an item while in use.)

3-Years

From MFG. Date. Based on Unopened container.

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