Caulking outdoor window sills and frames requires a product that will hold up to harsh weather conditions. Your best choice is Loctite PL Window Door & Siding Polyurethane Sealant because it forms permanent, water- and weather-resistant seals in most exterior gaps and joints.
Considering this, how do you protect a window sill from water?
To truly make it waterproof the edge and underside of the sill should have been sealed with a waterproof finish prior to installation. Then use a rubberized caulk such as a gutter and flashing caulk between the sill and the window. Polyurethane is a very hard interior finish.
Then, should I use caulk or silicone around windows?
For long-lasting protection around your windows, choose a high quality caulk made from silicone or polyurethane. 100% silicone caulk or a mix of silicone and latex, is waterproof, flexible, shrink-proof and will last over 20 years.
What’s the difference between caulk and silicone?
Caulk vs Silicone
The difference between Caulk and Silicone is that Caulk is for big purposes like in construction projects or in house, whereas silicone is mainly used to bind surfaces like metal, glass and plastic. Caulk is paintable and silicone is non paintable paint do not stick on these silicone sealants.
Where should you not caulk around windows?
Tip 4: Keep Caulk Away From Movable Parts
While it may be tempting to caulk all around your windows, caulking movable parts, for instance, may cause your window to seal shut. The ledge above the window frame also doesn’t need any caulk. This area has a drip edge that helps keeps the frame dry.