FAQ's - Paint

What is Kynar?

Kynar 500® is not a finished paint. It is a trade name for PVDF (polyvinylidene fluoride) resin, as is Hylar 5000®.

PVDF resin is the raw material used by licensed formulators to manufacture PVDF based coatings. When formulated into a coating composition, the paint contains a minimum of 70% by weight of Kynar 500® resin to manufacture a 70% Kynar 500® resin based coating, that meets the highest performance criteria of AAMA - 2605.

The key to a products performance is the resin chemistry. For the ultimate long-term durability, time has shown that PVDF resin is the one to choose. Other coating resins include acrylic, polyester, silicone polyester and urethane.

Do you recommend adding a clear coat?

A clear coat is only required over metallic colors and some bright and exotic colors. Adding a clear coat to a painted finish that is not required will not extend the warranty of the product.

Paint manufacturers do not recommended using a clear top coat over a white color paint. The application of a clear coat can affect the tone of the underlying color. The color coat typically shifts more yellow when a clear coat is applied.

Does Linetec use lead and cadmium in its paint?

For the health and safety of our employees, our customers, and our environment it is Linetec’s position not to apply paint coatings containing lead or mercury. As well, Linetec also prefers not to apply paint coatings containing cadmium.

Certain uses of paints and/or coatings, which contain lead, mercury or cadmium, are banned or restricted by federal, state and local laws, regulations and/or ordinances. Heavy-metal paint (containing lead, mercury, or cadmium) should never be used on any project that involves a school, daycare, playground equipment or any building surfaces that children will come in contact with.

Prior to your selection of a heavy-metal paint, we suggest that you fully assess all laws and regulations that may be applicable to your use and application.

To achieve certain bright and vibrant colors, paint manufacturers may use small amounts of cadmium in the paint formulation. Linetec works hard both internally and with the manufacturers to create the closest match possible without the use of cadmium. In many cases, however, the matches will not have the same color characteristics as when cadmium is used.

If the project color specified requires the use of cadmium, and cannot be matched without it, Linetec will consider these projects on a case by case basis. However, it is our desire that customers will choose to support our effort in eliminating the use of all heavy-metal paints.

What can I expect a paint finish to hide?

A typical architectural finish is applied with only 0.8 to 1.2 mils (or thousandths of an inch) of coating. A good rule of thumb is: If you can feel the blemish (scratch, ding, dent, etc.) with your fingernail, the paint will most likely not hide the defect.

Most solid colors will hide any staining or streaking of a substrate at the required film thickness; however, there are certain mica and metallic based colors that will not hide the substrate, and the use of a base coat may be necessary to further enhance the paints hiding effectiveness.

How important is the paint pretreatment system?

Regardless of the paint finish you choose for your project, Kynar®, baked enamel, or powder coat, the critical first step in the application process is pre-treatment. Without proper pretreatment, premature failure of the finish system can almost be guaranteed. Paint systems are designed to be applied over clean metal that has been properly pretreated.

The most time-tested pretreatment system for architectural aluminum products is a chrome phosphate conversion coating. Chrome phosphate conversion coatings continue to be recognized by many as the most effective pretreatment for aluminum. As a result, products installed along the seacoast and other harsh industrial environments may not be warranted or the warranty length and coverage may be compromised if a chrome pretreatment is not utilized.

At Linetec every piece of aluminum is pretreated with a chrome phosphate conversion coating, whether we are applying a baked enamel finish that meets AAMA2603 or a 70% Kynar® finish that meets AAMA2605. This assures you of the best quality pretreatment for your material.

FAQ's - Anodize
Bend aluminum prior to anodize

Can anodized aluminum be bent and formed?

Anodic films are very hard, and as a result, most post-production bending of anodized aluminum causes the film to "craze," which produces a series of small cracks in the finish. It is recommended that all forming and bending be done prior to anodizing.

What is the minimum thickness of flat sheets to be anodized?

Flat sheets must have a thickness of .040 to be anodized.

What can I expect an anodize finish to cover?

An anodize coating actually becomes part of the aluminum, rather than adding a thin layer over the aluminum part as with a paint coating. Therefore gouges, scratches and die lines can be enhanced by an anodized finish. However if eco-friendly anodize is utilized, the etching process will give the aluminum a frostier matte finish that will hide the irregularities and small scratches on the aluminum surface.

How do you touch up anodized aluminum?

Anodize touch-up should not be needed in most cases because anodizing is so hard that it is not easily scratched. Touch-up paint should be used extremely sparingly over anodize. Only the visible raw aluminum in the scratch or gouge should be touched up with matching paint (Alodine pretreatment should be applied first). In most cases, the match will not be ideal as anodizing is a transparent to translucent coating while paint typically is opaque and will not blend in.

Other fixes include:
Replacing the damaged piece with a new one
Cladding the damaged piece with another anodized piece
Clean, pretreat and paint the entire assembly.

None of these “other fixes” are good ones. The best repair is not to allow the material to get damaged in the first place. The number one cause of damage on the jobsite is not protecting the anodized material from harsh chemicals such as concrete/mortar or muriatic acid/brick wash. If reasonable care is taken during handling and high and low pH chemicals can be avoided, repair and/or touch-up of an anodize finish will not be needed.

FAQ's - Powder Coat
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Does Powder Coat qualify toward LEED credits?

Currently, the LEED rating system does not specifically include credits for the use of powder coatings or any exterior finish on the building. Architects can seek innovation and design points for use of a low-VOC exterior coating.

Is architectural powder coat more green than liquid Kynar paint?

Not necessarily. It is a common misperception that powder is more environmentally-friendly than liquid paint (e.g. Kynar/Hylar). The truth is that it depends entirely on the application process and how VOCs (volatile organic compounds from solvents used) are handled. Powder is by nature relatively free of VOC’s, regardless of application process. Liquid paint – which involves airborne solvents – is not. However, if liquid paints are sprayed using the right equipment, the VOC’s can be captured and converted to harmless water vapor. This equipment is commonly called an oxidizer or incinerator. Applicators that have and use this equipment can apply liquid paints without significant VOC emissions, achieving the same level of “green” as powder. No matter which finish is chosen, the end project will be completely free of VOC's.

What are the AAMA specifications for Powder Coat?

Powder coatings are held to the same AAMA performance comparisons as liquid paints are. Powder coatings formulated with standard polyesters can most often pass the AAMA 2603 specification. Comparatively, powder coatings properly formulated with super-durable polyesters can pass AAMA 2604 specification. Powder coatings manufactured from fluorocarbon polymer resins exhibit the greatest exterior durability and will meet the requirements of AAMA 2605.