TheOn 14/06/2021 21:23, alan_m wrote:
On 14/06/2021 18:21, Paul wrote:

As for the body filler idea, beware. My repair of an exterior
wood window frame, the body filler shrinks. And it shrinks, even
though it has several coats of paint over top. The issue is,
filler used on a car, you are only filling imperfections
and the amount used is not very thick. Whereas when replacing
a section of rotted wood, you might have a great thickness of
body filler, and that's when you'll notice the shrinkage after
five to ten years.

I did not find any shrinkage after five years with a temporary repair
using a whole large tub of car filler on a window frame I did
however dig out most of the rot and treated the remaining with a Ronseal
Wet Rot wood hardener before filling.

Before getting the windows replaced I had to get a round tuit for other
repairs hence the 5 year wait





The first time that I used Ronseal wet rot treatment and then their filler
was over 15 years ago. It was a window sill. It was as good two weeks ago
as the day it was cured. I have continued to use that combination during
all the years since and never had a shrinkage problem but it was only used
on well-seasoned timber. I have never used it on a car and I have done
quite a bit of body repairing over the years but never used the Ronseal
stuff.