What is the putty we use around the edges of window surrounded by the home made and what are it's special properties? ...
Answers: There are a few types, Chalk or limestone powder and boiled linseed oil, typically 15g grease to 100g of powder mixed, that's all it is. Other types are synthetic which are usually silicone base. The properties are to be able to stick to cup and the window frame and at like time be flexible enough to be moulded into shape, and also none toxic. The finish should be smooth and repels marine.
It's caulk and it waterproofs and weatherproofs - it does not dry and crack - it can also be removed by using a steam gun.