Use of Bondo

I don't used bondo. All metal by usg IIRC is way better product.
Even better yet is to cut out the metal and weld in new sections.
 
about 3/16ths of an inch is the maximum recommended depth . beyond that you are just caving and paving.
 
When use say bondo say it as a slang term . But Bondo the product is the worst filler ever. Try Evercoat or any other type professional filler. As soon as the paper hits it you will tell the difference.
 
Well since a tractor fender is usually pretty heavy gage metal and you can usually get at both sides to get it reasonably straight, one shouldn't need to go too deep (1/8-3/16) but with todays fillers one can even go deeper as long as it isn't around a mounting hole or light mounting area. And even if welding in a section you are still going to need some to get it perfect. They say never to use "bondo" on a 2 cyl john Deere because of viberation it will all crack. "They" are 100% wrong. 'taint 1950 anymore.
 
Of course the thinner the bondo the better however if you don't put it all on at once you can go thick with it. To prevent cracks press some fiberglass cloth into the bondo every quarter inch or so. If you go very thick with it you have to allow each coat cure for several days in order not to have too much shrinkage.
 
It's best not going thicker than 1/8th". Lots of people use sanding primer on stuff that needs filler paste,filler paste where bondo is called for and bondo where more dolly work is needed. I passed up an old car recently that I really wanted but had bondo slopped on. I could have removed it and reworked metal but I figured everything he had done to car was to the same standard.
 

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