MDF Window Sil Gap

[bezzas]

Hello All,

One of the interior window sil's is MDF (don't ask).

Problem is there is a slight gap between where the sil butts up against the uPVC window frame.

I have tried filling the gap with caulk and filler but it just shrinks and cracks.

could i use Ronseal High Performance Wood Filler to fill the gap between the sil and the uPVC window frame?

http://www.ronseal.co.uk/products/high-performance-wood-filler

will it stick to the frame?

Thanks

Andy

 

[foxhole]

Needs to be flexible, a silicone would be better and can be cleaned easily.

 

[bezzas]

was worried silicone would get water behind it or go mouldy when the windows get condensated up in winter?

 

[foamit]

Run a Bead of good quality plumbers silicone along gap it should not go mouldy

 

[big-all]

yep silicon but finnish painting the window board first as paint wont take to silicon