Car filler or putty for glazing sashes.

I’m replacing the glass in two sash windows on the front of our 1928 house in Sydney.
They are protected from the weather by the verandah.
I am thinking of using car body filler instead of putty, has anyone done this?
Any reason why I shouldn’t.
I’m a patternmaker by trade, did my time when patterns where made in timber and the fillets were putty.
After a few years the trade changed to car bog for fillets when that came on the market here in Oz.
So I know how to use it, l am more interested in longevity etc.
H.

Never tried it for that purpose but have glazed plenty of windows with linseed putty.
Just wondering what problem or issue you are looking to solve?

Initial thoughts are bog sets hard whereas putty stays flexible for many years. Yes it eventually dries out and goes hard and in wooden frames that is when it starts to fall out.

I can't think of a good reason not to try it. I did find that in comparison to builders bog a brand of auto body filler I got from Supacheap Auto, think it was Septone, was more flexible. I don't know if there's merit in more flexible.

Thanks for the input guys.
I don’t have any putty and don’t like it particularly.
My car bog is very old and I need to buy some fresh stuff for a resto I’m doing.
Guess I’m just more comfortable using bog rather than putty.
Builders bog is as was plastibond.
The putty was at least 38 years old and I had to use my multi tool to get it out.
So flexibility is not on the agenda.
H

Car filler sets hard, as you know. Panel beaters will file and sand it. And to withstand the vibration, heat, and body flex that a car goes through in everyday life it has to be tough. I have no experience, but it’ll probably last well.

So, when that window breaks and you have to remove the stuff to get the new pane fitted, you might well wish you had used putty in the first place. By that time you might just want to call in a glazier who may well charge extra for the extra time it takes to remove the stuff.

Every time I use builder’s bog it sets too fast. I’m probably using too much hardener, but the last thing you want is too little hardener. Maybe auto body filler sets slower? I haven’t tried it. Puttying a window is a fiddly job. Your filler might go off before you can use it.

The putty was as hard as any bog I’ve dug out of old patterns whilst doing repairs and mods back in my trade daze.
I didn’t have a multi tool back then just an old chisel or gouge.
A sharp skarsten scraper was skidding over the stuff.
H.

I don’t think the window will take as many meters of fillet as this pattern.
H.