Material Precautions

Fluoropolymer resin-based coated finishes (often referred to as Kynar®) provide long-lasting protection against weathering, aging and pollution on architectural, commercial and residential buildings around the world. The sustainability of fluoropolymer resin is unparalleled in the industry. 

Flat Sheet

Be aware that flat sheet, leveled and sheared, may return to coil memory when baked in a cure oven, subsequently causing some tolerance issues or curvature in the sheet.

Assembled Parts

Solution entrapment from the pretreatment process can be problematic to assembled parts. Material that will carry water must be drilled to allow drainage of the water in capture areas. It is recommended that customers make provisions for this prior to sending for finishing. 

Welded or stud welded attachments

Welded or stud welded attachments may cause flat sheet or break metal to distort when baked. Once distorted, the sheet or break metal may not return to its original shape when cooled. Welding will almost always cause distortion on aluminum sheet that will be noticeable after painting.

enclosed tubes

Tubes with welded ends rarely are completely sealed and water will leak inside the tube. Enclosed tubes will require drain holes for the entrapped liquid to escape.

radius material

The heat from the baking process may distort radius material out of tolerance. 

Extrusion Thickness

If extrusion wall thickness varies significantly on your project, color uniformity may be at risk. This is due to the differential in baking temperatures to get the metal to temperatures required to cure the paint. If a heavy walled extrusion is painted with a thin bead die, the bead die may over-bake, resulting in a darker appearance and lower gloss, as well as possible warpage of the metal.


Linetec’s pretreatment system is not equipped to remove non-water soluble oils. These types of oils contaminate the system and cause “fisheye” problems with the paint finish. Fisheye is a defect in the paint film appearing as a circular depression resembling a crater but not revealing bare substrate.


Storing metal outside prior to painting can cause corrosion that, unless removed by sanding, will cause staining and poor aesthetic quality.

extrusion process

Residue from lead and wax used in the rolling process of tubes and extrusions will cause contamination problems if all of it is not removed. The lead and wax may run out in the baking process and cause damage to the paint finish and metal.

AAMA Verified Component Licensee

American Architectural Manufacturers Association, a material-neutral organization, is the source of performance standards for the fenestration professionals of window, door, skylight, curtain wall and storefront manufacturing companies.


As your Single Source Solution we offer custom options and specialty finishes such as Wood Grain Finishes, Copper Anodize, Spattercoat and textured Terra Cotta Coatings.


Linetec has earned a long-standing reputation as a leader in environmentally-conscious practices and finishing options. For more than a decade, environmental responsibility has been written into our core values.


Our technical experts at Linetec provide valuable industry education of high-performance architectural finishes to architects, engineers, specifiers and manufacturers.

Photo credits: Super Sky Products intl
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