2K PU Coatings

What are the advantages of 2K PU coatings and clear coats from HP-Textiles?

2K PU coatings such as HP-PUR and HP-PP offer high surface hardness and durable protective properties. The HP-PUR topcoat is a scratch-resistant 2K coating, ideal for smooth, glossy finishes on CFRP, GFRP, and plastic parts. It is resistant to weathering, fuels, and UV radiation and delivers outstanding coverage. For textured applications, HP-PP-TEXTUR provides a non-slip surface texture, suitable for grip-intensive zones. Thanks to their chemical resistance, color stability, and ease of application via brush, roller, or spray, these coating systems are suitable for automotive parts, boat building, sports equipment, and industrial components.

What types of coating systems are available?

The range of PU and clear coats for composites is diverse – depending on the surface and application, different systems with defined performance profiles are available:

> Primer “Undercoating”
The HP-UC primer improves adhesion between substrate and coating layers – particularly on GFRP, CFRP, thermoplastics, and difficult plastic surfaces. It ensures a uniform topcoat finish and enhances durability against delamination, chemicals, and thermal cycling.

> 2K in-mould coating (IMC)
HP-IMC is a reactive 2K polyurethane coating applied directly into the mold. It provides a scratch-resistant, UV-stable, and colorfast surface already during molding. Especially in CFRP or GFRP visual parts, it eliminates the need for post-finishing. The coating is temperature-resistant, solvent-resistant, and results in a uniform surface without defects.

> 2K PUR topcoat
HP-PUR (smooth) and HP-PP-TEXTUR (textured) offer a high-coverage polyurethane finish with mechanical durability. These are ideal for technical components made of CFRP or GFRP that require impact resistance, UV stability, and chemical protection. The textured version adds a grip-enhancing feel and is suitable for step areas or functional surfaces.

> 1K clear coat
The clear coats HP-KL500G (glossy) and HP-KL500M (matte) create a highly transparent protective layer for both decorative and functional applications. They are designed for use on metal and wood surfaces, paintable plastics, and epoxy resin surfaces and castings. With easy application, UV protection, and impact resistance, they are ideal for finished components, coated parts, or technical decor elements.

How do in-mould coatings for composite materials work?

HP-IMC is a 2K in-mould coating applied inside the mold before introducing the laminating resin. This creates an integrated surface layer with a uniform appearance – without the need for post-processing. It is ideal for CFRP components requiring even color application and a UV-stable, scratch-resistant finish. Especially in serial production of carbon or GFRP visual parts, this method saves time and cost. The 2K PU in-mould coating is heat-resistant (up to 80 °C), abrasion-resistant, and solvent-tolerant – suitable for high-end visual parts in both interior and exterior use.

Which clear coats are available for optical finishing?

HP-Textiles offers 1K polyurethane-based clear coats in glossy and matte finishes. HP-KL500G delivers a high-gloss, transparent protective film on metal, wood, paintable plastics, and epoxy resin castings. It provides UV resistance, is non-yellowing, and impact-resistant, giving surfaces a premium finish. HP-KL500M creates a matte, elegant appearance without compromising durability. Both versions are solvent-based, easy to apply, and suitable for indoor and outdoor applications. These clear coats are ideal wherever surface protection, long-term durability, and visual quality are key – such as on embedded components, coated workpieces, or functional design elements.