In article ,
robgraham writes:
This is a top hung DG window frame in pine - possible someone like Magnet as the source. It's done 23 years so I perhaps should be grateful that just one of the six in the extension has deteriorated.

It's the bottom bar (of course!.)

The rotted area is some 12" x 1" x 1" - that of course is at least !!

I see 5 options

1 See if there is a replacement frame on the market - suspect unlikely

2 Get the local joiner to build a new frame

3 Build a new one myself

4 Cut out and patch with wood

5 Cut out and patch with car body filler while perhaps I do #3 over the winter.

Replacing the bottom bar is really a no-no as the frame will have to be out of the window for a period and this window faces the main road.

How good is body filler for this type of bodge ? My thinking would be to anchor it to some screws into the less rotten wood.

You can buy wood filler, which is basically the same stuff.
You start by digging out the rot, and then liberally paint on
a resin stabiliser which soaks in and converts what's left into
resin with rot proofing for the timber fibres. Then mix up
resin-based filler to replace what's missing, and it sets
quickly. Can be sanded down afterwards, and painted.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]