On 14/06/2021 18:21, Paul wrote:
Chris Bacon wrote:
Ronseal wood filler seems to be styrene and talc, mixed, with hardener
you add and mix.

Sounds awfully like car body filler, which is lots cheaper. Is it the
same, or different (how)?


polyester resin and "cream hardener"

Not the same.

The big book of chemicals has one million compounds
in it. And that's just scratching the surface, so to speak.
You could easily fill a store with items, where no two
were the same.

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.

What the hell's "cream hardener"? Details, please, details.

Car body filler generally containd styrene and an inert substance,
normally talc, calcium carbonate or whatnot. So does Ronseal wood filler.

I've used car body filler to fill holes in timber before. I have not
known it to shrink Like the Ronseal stuff, it stays the same, but the
timber itself can change.

What filler did you use? Car body filler can certainly be used in thick
layers. Maybe the "imperfections" you refer to are filled with
"stopper", not "filler"?