Teroson UP620 White Gelcoat Filler
TEROSON® UP 620 by Henkel is a fast-setting, polyester-based gelcoat filler designed for a fast repair on white gelcoat finishes, such as boat hulls and fibreglass panels. The manufacturer states that the application time is approximately 12 minutes at 20°C (room temperature), and is ready for sanding within about 20-30 minutes at room temperature. In our experience, these times are relatively accurate. However, when working in colder or warmer environments, considerations for working time may be necessary; cold conditions will typically slow the cure rate, whilst warmer temperatures will speed it up. An infrared heater set to a maximum of 60°C can cure the product in approximately 10 minutes. Although other heating methods, like a heat gun, may be used, we recommend doing so with caution to avoid overheating the area and causing further issues.
Compared to standard gelcoat, the overall repair process with Teroson UP 620 can be significantly quicker. The filler has a thixotropic consistency that spreads easily, eliminating the need to add flow modifiers or additional filler powders typically required to achieve the right consistency for regular gelcoat repairs
In a small side-by-side comparison of Teroson UP 620 and regular gelcoat for a repair at room temperature, we found that the Teroson product was considerably faster, Even with a few additional touch-ups! The UP620 was sanded and polished, and the repair was completed around the same time, just as the regular gelcoat started reaching a finger-tacky state of cure. A real advantage for rapid repairs!
Offering some criticism, one downside of Teroson UP 620 would be colour. Realistically, it's not going to match all shades of white, but for small chips/dings or areas that are not easily visible, it's unlikely to be a significant issue. It can at least serve as a temporary repair to keep things operational until such times as a colour matched repair can be completed.
We frequently receive inquiries about using pigments with Teroson UP 620, and we have concluded a few basic tests with some of our polyester pigments, which we will cover on another blog post.
List of products used below:
