Gelcoat is a gelling polyester resin that is viscous in the usual dosage form and in the manufacturer-specific mixing ratio. Rough painting with a roller or a hard bristle brush is usually difficult. The consistency similar to paint or paint in terms of brushing behavior is called a topcoat.
A mixture of two components is most commonly used to apply gelcoat. Before use, the polyester resin is mixed with a dose of hardener specified by the manufacturer and then takes up to twenty minutes to process.
- Also read - Sanding tack-free gelcoat
- Also Read - The Definition Of Gelcoat
- Also read - Gelcoat needs careful processing
According to the definition, the gelcoat becomes chemically more complex or less complex, depending on the mixing ratio and product, as the molecules are more closely linked. Normally, this results in a viscous flow property that is more similar to a filler (4.25 € at Amazon *) than a brushable paint.
For the painting of gelcoat, the manufacturers offer gelcoat with liquefying additives, which is offered on the market under the name Topcoat. Its dosage ratio is adjusted for spreadability and is usually applied as the last layer and sealant on the regular gelcoat.
In the ideal case and with professional processing, the gelcoat will combine with the underlying fiber-reinforced plastic and the topcoat in turn with the underlying gelcoat. In this way, a homogeneous unit is created, which "protects " each other against loads and damage.
How to paint topcoat
- Gelcoat and hardener
- Top coat
- Possibly pure polyester resin
- Hard bristle brush
- Plastic coating roller
- Plastic film
- Respiratory and eye protection
1. Finish the gelcoat layer
Apply the gelcoat layer by layer according to the manufacturer's instructions with a spatula, a roller or a hard bristle brush.
2. Smooth the gelcoat
Instead of applying the last layer, stretch a plastic film on the fresh gelcoat surface and smooth the surface with a hard sponge or a brush with soft bristles.
3. Use a topcoat
If you are using a spreadable topcoat, consider the application as the final layer of the gelcoat. Use the coordinated system products from the same manufacturer for gelcoat and topcoat and follow the processing instructions. Topcoat can be sprayed and rolled.
4th. Dilute the gelcoat
Theoretically, gelcoat is a thickened polyester resin. You can increase the flowability by adding pure polyester resin, but this can affect the degree of curing.Tips & Tricks The toxic diluent styrene used by the manufacturer is present in a higher concentration in topcoat than in gelcoat.