Internal window sills

[shocksl]

What's the best compound to use to fill the gabs between the window and rhe internal sills ?

 

[Chuck]

I don't know whether it's 'best' but this is what the local window-guy recommended when I had the same question:

Decorators Caulk | Soudal

www.soudal.co.uk

It's got a shelf life of 12 months so get it from somewhere that has a good turnover of stock and check the manufacturing date, which is printed on the cartridge before buying.

If the gap is more than a few mm you are probably best to use some 'window sealing strip' and or some form of packing.

If you want to make a nice job, have a couple of practice runs first, or start on the least-visible section.