Hello,
the window sill on my rear window is quite old and has been painted over many times. I can't see any hints of cracks or so, but over time with flaking paint etc. it has developed a very uneven surface, which collects spots of water when it rains. See picture below. I don't have access from the outside, but looking for some ideas to flatten/smoothen the sill on the top, so it does not collect water and develops moss, like the one in my front window (second picture).
Could I just use a good amount of toupret exterior filler to lay a flat (maybe even slightly downward sloping) new surface on top and coat this with zinsser primer followed by a coat of outdoor masonry paint? Or will I do more harm than good?
Rear
Front
the window sill on my rear window is quite old and has been painted over many times. I can't see any hints of cracks or so, but over time with flaking paint etc. it has developed a very uneven surface, which collects spots of water when it rains. See picture below. I don't have access from the outside, but looking for some ideas to flatten/smoothen the sill on the top, so it does not collect water and develops moss, like the one in my front window (second picture).
Could I just use a good amount of toupret exterior filler to lay a flat (maybe even slightly downward sloping) new surface on top and coat this with zinsser primer followed by a coat of outdoor masonry paint? Or will I do more harm than good?
Rear
Front