Saint Paul, MN
Quoted from Aurich:Bondo is a brand name for a an automotive filler putty. I think it's owned by 3M. It's not marketed as something for wood, but it's pretty general purpose.
You are correct - 3M bought bondo a few years ago. I've been to the plant a few times...
Quoted from Leo13:If it's an automotive product, that explains why I was lost today in home depot...
So mixing with a hardener is mandatory ? What is the commonly used ratio between the paste and the hardener ?
The ratio in normal temperature conditions is 50
. Good luck getting that measured accurately. Most technicians put a big blob of the filler down and then draw a line of the catalyst across the top and then mix it together. Go heavier on the catalyst (but not too heavy) if you are working in cold weather or lighter if you are working in hot weather. The more catalyst you add the faster it will harden and the quicker you can start sanding. Like I said though, don't add too much catalyst or that can have long term issues.
