We have following advice:
1. Have to be min. 18 degrees.
2. Add 2% hardner. (you have to buy separately item no. 81000104)
3. Sand/clean the surface.
4. Use a paint roller with very short hair. (not included)
5. Mix only a small amount and add only a thin layer.
The non-skid gelcoat can be bought from WINNER in small cans of 350gr.
Plenty non-skid for one boat.