Good product that will set rapidly even if there is some moisture present. I do find that it can set too hard and crack etc, It is also fairly coarse.
Best thing is to treat the putty like filler. In the case of smaller ding where added weight is not an issue, when you get a chance, sand it flush and give it a light coat of decent 2 part epoxy with at least one layer of 4 oz glass.
The Araldite resins like the one at the top are great for temporary repairs. However, while they are a lot more flexible and runny for better penetration, they are also a lot more sensitive to moisture. You need to make sure the site is dry and leave the board out of the water for a lot longer. Unlike the putty, it is not as easy to fill large holes. They also don't sand as well.
Still, you could use the liquid epoxy to temporarily seal over the putty filler. Not a bad system?
Worth taking both along?