How Thick Can Bondo Be? Will Auto Body Filler Crack, Shrink, Fall Out?

[Music] when it comes to fixing dents with body filler one of the most common questions or concerns is how thick can bondo be napa know-how online says no more than a quarter inch or else quote the repair won't last long and eventually shrink possibly crack or even fall off and that is absolutely not true even though i rarely use filler thicker than a quarter inch in the past i have and the filler or bondo has never shrank never cracked and never fell off today we're going to be fixing this long dent without pulling it bumping it pushing it out or anything we're just going to fill it and even though it looks deep we're going to go to the deepest point and put this straight edge and we're going to even bow it a little bit and even though that's about the curve of the body even though we got it curved right there quite a bit that eighth inch drill bit barely fits in the deepest part so we're only looking at under an eighth inch of filler to repair it we'll first wipe it down with some wax and grease remover knock down any high spots and i think there might be one right here and maybe right here then we'll grind the area clean and fill it and i just have some of that wax and grease remover in an empty spray bottle makes it a bit easier and i'll just hit this paper towel and we'll wipe it with that first and then come back with a nice clean one over the top we'll knock the high spots down with a pointy hammer like this to prepare for filler so we never have any problems or issues we'll grind it clean with a fresh 36 grit fiber resin disc on slow speed so now using a stanley shear form or a cheese grater blade will take some excess off now we'll be using a clean sheet of 40 grit on an air file so so [Music] these were a few low spots i noticed while sanding so i filled them in and we're going to hit them real quick here with the cheese grater and the good thing about using a cheese grater right now is you can't mess up the stuff you did before and that's real close i'll let it dry a bit we'll come back and hit it with some 36 grit on a long board and that's good i'm gonna block sand this with some 80 grit d.a sand it and prime it so you can see what the finished panel looks like [Music] after a few coats of primer surfacer this panel is ready to be block sanded primed again finished sanded and painted in my opinion thickness of filler is something you really shouldn't even worry about as long as your rough bodywork or metal work is close you're not throwing filler over gaping rust holes and you've prepared the surface correctly you'll never have issues like cracking shrinking or bondo simply falling out i hope you enjoyed this video and if you did and you'd like to get my latest videos don't forget to hit the subscribe button

Channel: Lakeside Autobody

Views: 102,647

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Id: rIoNhu166Hw

Length: 7min 56sec (476 seconds)

Published: Fri Aug 20 2021