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itsmecord 11-15-2009 08:26 AM

JB weld as body filler ?
So I have a buddy going to college for automotive and collision repair,and was talking to him the other day on the phone about having shaved the tail lights on my wifes ghia.I was given some advice that was rather interesting......He said that at school they were teaching them to use JB weld as a filler in the metal ? Now I could see how it could work but I just tend to be the type to use as little of any filler as possible and where I have to use it I want the best I can get and he claims JB weld is it. :eek: :eek: :eek:

302 Z28 11-15-2009 08:45 AM

JB Weld is great for what it does, but using it as body filler seems more than a bit expensive and that is not what it's intend for. I would look for advice from another school if that is what they are telling their students to use.


matt167 11-15-2009 08:46 AM

well, it will work. and I have used it for that ( actully quick steel putty, which is the same ).. but it's by no means professional

Jake_Dragon 11-15-2009 08:47 AM

For small high impact parts it may be worth it but other than that I would stay away from it.

MARTINSR 11-15-2009 08:58 AM

I'm with the others. Been in this business for over 30 years, done all kinds of stuff and NEVER would I have ever used JB as a "Body filler". There are MANY different products on the market and have been for years that are DESIGNED to be used as a body filler.

There are "reinforced" fillers like Evercoats "Everglass" and "All Metal" and many, MANY others that will do the job with a LOT less money and work.


oldBodyman 11-15-2009 10:41 AM

JB Weld would set up too hard and brittle for the expansion, contraction and vibration of auto body. Way too expensive and too much like work.

cboy 11-15-2009 10:58 AM

I've considered using it as a filler on metal brackets and such that I want to powder coat. I'm not sure, however, if it would take the 400 plus degrees in the oven (anybody know for sure?). But I think it would work for a purpose like that in terms of vibration and body flex where it might not be advisable on a large thin panel.

eloc431962 11-15-2009 11:18 AM


Originally Posted by matt167
well, it will work. and I have used it for that ( actully quick steel putty, which is the same ).. but it's by no means professional

I have used both but in a Inconspicuous place like in the trunk area.


mitmaks 11-15-2009 11:28 AM

I would use some metal-to-metal

kenseth17 11-15-2009 12:50 PM

I haven't used jb weld, but have used epoxy based adhesives before for filling small holes where didn't want to weld, and used bodyfiller over that. You have to watch though, many recommend epoxy priming first before using any bodyfiller over adhesive, but believe that is mostly urethane based stuff.
I would not consider using jb weld as a body filler, although something very similar is often done on urethane bumper repairs, using a adhesive that has some flexability for the majority of the repair, and regular filler for final finishing work.

If I was stuck on using epoxy as a filler, well then I'd probably use an epoxy fairing compound, like I've used in the when working for some boat builders (basically bodyfiller in marine terms). Its a 2 part filler as a base and convertor must be mixed together.
Haven't really seen any bodyshops using it at all. although I am sure somewhere some place might, but fairly commonly used in the marine industry. I like fiberglass filler when a bit more fill or a bit more water tight filler is wanted then comfortable using plastic filler, but would actually prefer using the epoxy filler over all metal junk that I was forced to use a whole lot of at a past job.

itsmecord 11-15-2009 05:40 PM

All the above were my thoughts...I argued the point with him,and finally gave up because I did not no FOR SURE.As some have mentioned,and as I told him why use such a thing when there is products made for it.Now that I have this thread I will e-mail it to him and let him simmer on that for a while ! :boxing:

Chevrolet4x4s 11-15-2009 07:18 PM

I used it on a bike frame probably 6 years ago,dent on the top tube, It has held up fine.You can't tell that it was ever repaired,granted it was a small area 3/4" wide 1 1/2" long and around 1/4" deep. It is a major pain to work with though,I ended up using files to shape it and then sand it smooth.

dalesy 11-19-2009 04:21 PM

Man, I wonder if that school is teaching him to repair body damage like an old Popular Mechanics article I saw years ago. It showed a Karman-Ghia with a rusted out rocker panel. They said to grind out the badly rusted area, bend in the sharp edges, then stuff the rocker panel with newspaper and bondo over it. Simple, huh?

Wouldn't you loved to have seen that after about a year or so....when that newspaper got all soaked up with water?

itsmecord 11-19-2009 05:00 PM

Well,this is what he told me to do with my ghia after his schooling;50 grit the body to bare metal,jb weld all large holes over 1/2" bondo anything under 1/2",180 the entire car,Next hit it with the laquire sp ? black primer I have,or get an etching primer using a 2.0 tip in my gun 180 it again he also mention throwing some 400 grit in there somewhere to but i dont remmeber where....then using a 1.4 spray my paint "any paint will do,it's not the paint that matters only the clear."He also said if I would like him to do it he could spray B/C,C/C on the car so smooth that it will not require ANY cutting buffing to be show quility.

302 Z28 11-19-2009 05:15 PM

That is some really bad advice, filler should never be used to fill a hole without a solid backing (welding it closed) and you should never use lacquer primer....unless you are after a failed 60ish paint job. What is this bozo getting paid to teach this nonsense?


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