What do I use to replace rotten wood??

I have some windows where the bottom left hand corner (inside) gives way when I push on the paint and it appears that the wood underneath has rotted away (nearly 50 year old house).



Before I dig it all out - can I just use builder's bog and or putty to replace the rotten wood before painting?



Obviously I will also need to look for any dampness issues that caused the problem in the first place as well.





Read and reply to the full thread at RenovateForum.com....