Article Issued on Nov 2019. Source : MBCI and Berger Beckers
There are many touch-up paint tips for metal roofs available, but the best advice we can offer is to carefully consider your options and the finished appearance you’re looking for.
Scratches and very minor damage may occur during the handling and installation of painted metal roof and wall panels. In these instances, it may be desirable to use touch-up paint to repair the blemishes. Keep in mind, touch-up paints are quick fixes and when used properly, will result in a satisfactory appearance. Misuse or over-use can result in spoiling the overall appearance.
The paint systems used on factory painted steel have a built-in color and gloss retention that is only achieved through the oven-baked process. Air-dried paints will fade and chalk much faster than oven-baked. These different weathering characteristics must be taken into consideration when touch-up work is contemplated.
If you decide to use touch-up paint, use it sparingly and only to cover up those areas where paint has been removed. Below are steps to prepare the metal before using touch-up paint.
- Use a paint pen or 1/4″ artist brush – Only the narrow edge of the paintbrush should contact the scratch or blemish
- Lightly sand or “feather” with #400 grit sandpaper for edges of deep scratches
- Treat scratches that expose raw steel (scratches through the paint and protective metal layer) should be treated with a zinc-rich (or similar primer) before colored touch-up application
The recommended paint type for touch-ups is an acrylic silicone paint, Epoxy Paint, PU paint. This paint type can be found at local paint stores or an Air Dried Kynar system (ADS II), can be sourced through PPG Industries , Nipon , Berger beckers, Akzonoble, Hempal, Jotun.
Special attention should be given to the manufacturer’s instructions including direct skin or eye contact, ventilation, and potential flammability. Aerosol or spray applications are not recommended for blemish or scratch repairs.
Consult the metal panel manufacturer
To ensure you or your maintenance professional properly select and apply touch-up paint, be sure to check all warranty and installation requirements and resources with the metal panel manufacturer. They can help ensure you get touch-up paint that matches the paint originally used on your panels and that you take the right steps to ensure warranties remain intact.
