Bondo/fiberglass as the right choice
72bluNblu said:
....Welds don’t need to be covered with anything different than any other metal. It they’re structural just paint them, if it’s bodywork grind them smooth and paint them.
I know context is a difficult thing for you to understand, but my response was to this post -
I cover my welds with short strand fiberglass. What do you suggest?
The type of weld isn’t specified. It’s not mentioned if this is a seam between two different body panels, a butt weld like on a patch panel repair, or even a structural weld.
No weld
has to be covered by fiberglass or bondo for the sake of the weld.
For bodywork, it depends on what it is. A seam, like the factory roof/quarter seams, may need filler. What kind depends on how thick the seam is! A butt weld should be ground smooth and only require a skim of filler. And structural welds can be painted or treated for corrosion protection but should NEVER be covered, because they need to be inspected (think roll cage welds).
On factory seams I use lead, or the modern “body solder” equivalent that is allegedly less toxic. Like at the tail panel here
Fiber strand / Duraglass on all seams , Then finish over that with Bondo / Plastic, Ruff it in with #36 then #80 and coat it with a good fill-in-sand urethane. Block it #220 then reprime let it sit for 2 days and re block it with #400. and then edge the car with color, then #600. for paint.
That is the way I was doing it for years. If there is a newer product to eliminate that worK I would like to hear it. I am getting to old for all that block sanding
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Ah, so you use duraglass and bondo for seam treatment and as a skim coat like it’s supposed to be used.
Im pretty sure I know the answer to this, but I’m guessing you wouldn’t use fiberglass, metal screen from the hardware store, with bondo, pop rivets etc to make a lower quarter panel right? Like this?
Pretty sure this isn’t something I’d find on one of your restorations.
Why would you have an estimate on that type of repair and not one for a metal repair ?
I think we have no real data on fiberglass repairs that were done in a similar fashion as most were probably not treated and sealed. The environment the car will be in is the biggest factor so any estimates on how long either will last..depends.
Aside from that - this might be the most practical way for this repair on this car. What would be an estimated cost of a metal repair on this be , assuming the person wouldn't do it themselves ?
No data? Of course there’s no data! No one studies this scientifically.
But anyone that’s actually done bodywork and rust repair on classic cars for any amount of time has seen what happens to cars with bondo and fiberglass repairs like yours- they fail. And the result is harder to fix than the original damage.
I know you think your fiberglass, screen and bondo repairs are somehow “special” and different, but every hack that shortcuts real repairs does work exactly like yours. It all fails. Your work isn’t any different than any flipper or con man’s.