All painters caulk can be used outside. Use something elastomeric at the least. Big Stretch is a common choice found nearly anywhere. There are heavy duty caulks available, but are difficult to use, and are solvent based, so I generally avoid them.
Also, even though it would look better, I dont caulk right underneath window skirtboards, in case in water gets in and needs to escape. The top of the window header though, you should make sure you caulk the crap out of. They can be overlooked sometimes, and its very important.
Also, even though it would look better, I dont caulk right underneath window skirtboards, in case in water gets in and needs to escape. The top of the window header though, you should make sure you caulk the crap out of. They can be overlooked sometimes, and its very important.
