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Will Bondo Spot Putty adhere to bare aluminum? #4462222
07/17/17 06:45 PM
07/17/17 06:45 PM
Joined: Jan 2007
Posts: 449
LBP
Mr_Accord Offline OP
Mr_Accord  Offline OP
Joined: Jan 2007
Posts: 449
LBP
I have a set of old mirrors for my SAAB where the painted aluminium finish has started to peel away from the assembly revealing the white aluminium oxide build up underneath. I have used some aircraft paint stripper and a brass wire wheel to clean the whole frame down to bare metal. The oxide has left some small pitting and pin holes over certain areas of the surface. Its a bit too much for any etching primer/paint with filler properties to take care of, but also a bit too much for body filler. Will glazing + spot putty stick to bare aluminium or do I have to etch prime it first?

Thanks


1990 VW Jetta GL 1.8L 8V - SOLD
1992 Honda Accord Lx - SOLD frown
1993 Ford Aerostar XL 4L V6 - Retired RIP
2004 SAAB 9-3 ARC 2.0T - Current
Re: Will Bondo Spot Putty adhere to bare aluminum? [Re: Mr_Accord] #4462236
07/17/17 07:05 PM
07/17/17 07:05 PM
Joined: Dec 2016
Posts: 7,199
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 7,199
Waco, TX
Bondo will work for a year or two, but if you have "small pitting and pin holes", use JB Weld instead.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Will Bondo Spot Putty adhere to bare aluminum? [Re: Linctex] #4462289
07/17/17 08:01 PM
07/17/17 08:01 PM
Joined: Jan 2007
Posts: 449
LBP
Mr_Accord Offline OP
Mr_Accord  Offline OP
Joined: Jan 2007
Posts: 449
LBP
Originally Posted By: Linctex
Bondo will work for a year or two, but if you have "small pitting and pin holes", use JB Weld instead.


JB weld can be sanded and painted over?


1990 VW Jetta GL 1.8L 8V - SOLD
1992 Honda Accord Lx - SOLD frown
1993 Ford Aerostar XL 4L V6 - Retired RIP
2004 SAAB 9-3 ARC 2.0T - Current
Re: Will Bondo Spot Putty adhere to bare aluminum? [Re: Mr_Accord] #4462290
07/17/17 08:05 PM
07/17/17 08:05 PM
Joined: Dec 2009
Posts: 762
Battle Creek, MI
SVTCobra Offline
SVTCobra  Offline
Joined: Dec 2009
Posts: 762
Battle Creek, MI
Yes. I've used it in painted applications a couple of times and never noticed any differences. I would sand it and prime first to do a better job.


Think twice, speak once.
Re: Will Bondo Spot Putty adhere to bare aluminum? [Re: Mr_Accord] #4463757
07/19/17 08:29 AM
07/19/17 08:29 AM
Joined: Dec 2016
Posts: 7,199
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 7,199
Waco, TX
Originally Posted By: Mr_Accord


JB weld can be sanded and painted over?


Yes - push it "into" the pin holes and it will never "fall out" like bondo will.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Will Bondo Spot Putty adhere to bare aluminum? [Re: Mr_Accord] #4466687
07/21/17 08:06 PM
07/21/17 08:06 PM
Joined: Jul 2017
Posts: 43
Tennessee
OilSwag Offline
OilSwag  Offline
Joined: Jul 2017
Posts: 43
Tennessee
Everclear > Bondo
Bondo is lacking in the quality department. Many premium, longer lasting, easier to use products out there. Not just Everclear but I suggest using almost any good branded body filler over Bondo. It was good stuff compared to what was around in like the 80's. All those cars you see with body filler dropping out, cracking etc is almost always Bondo brand


03 Infiniti G35 209K, Castrol Edge 5W30 topped with Edge HM, Fram Ultra Filter, Berryman/MMO fuel maintenance in 93 E0, all synthetic fluids
Re: Will Bondo Spot Putty adhere to bare aluminum? [Re: Mr_Accord] #4466697
07/21/17 08:16 PM
07/21/17 08:16 PM
Joined: Oct 2014
Posts: 12,594
Idaho
CT8 Online content
CT8  Online Content
Joined: Oct 2014
Posts: 12,594
Idaho
look up Alodine before you do any work on the aluminum.


2015 Ford F150 2.7
2018 Ford F350 6.2
Re: Will Bondo Spot Putty adhere to bare aluminum? [Re: Mr_Accord] #4466971
07/22/17 08:23 AM
07/22/17 08:23 AM
Joined: Nov 2006
Posts: 20,603
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 20,603
MA, Mittelfranken.de
Once the aluminum is bare and wire wheeled wipe it down with vinegar and dry it, the mild acid will remove any light oxidation in the "pores" of the metal, immediately apply JB weld, oxidation occurs quickly so do right away.
Sand down the jb weld with a dremel, orbital sander or by hand then apply self etching primer, now you apply filler over the etching primer to any remaining defects. Another couple of coats of etching primer and then refinish with primer filler, paint and clear.

I see there is a debate on the quality of filler, first its all the same base materials in different quantities, talc being one of the primary ingredients and that's the problem with polyester fillers.

Some are easier to sand, have fewer air bubbles but all will absorb moisture (including the so called metal fillers) as does one part primer fillers, the trick to long lasting repairs with fillers is to encapsulate it. If there is one step to successful rust repair this is it, we see it all the time a rust repair only lasting a short time before rust starts coming back through the paint in the form of bubbles, many times when you pop these water comes out and when you grind it down you see the repair patch is still in tact with no further rust through, what happened?

Once the panel was welded and patched it looked great so its all ground down and "bondo" applied. the repair is doomed to fail at this point. Any pin hole anywhere in the seam of the patch will now allow the filler to absorb moisture (even from the air) from behind and wick out under the paint.
A coat of epoxy like JB weld over the entire seam inside also if possible will ensure the filler remains dry. Sand the JB down its only to fill any sort of pin holes which almost always happens even if you cant see them when welding thin sheet metal.

Once the JB weld is sanded down apply a self etching primer to the whole area then apply the filler, you have now sealed the filler from behind. apply a good quality 2k epoxy primer then a poly primer over that to finish the job then paint. The filler is sealed from both sides and the repair will last a very long time.

Back when I first started we brazed a lot of panels and it was not as big an issue, we also used lead filler on some higher end cars. This worked great on thick sheet metal but today its very difficult, panel distortion and the dangers of working with lead are nothing for the DIY or even most pro's today have never been taught how to use lead and more important use it safely. Pick and file work is nothing on new cars the metal isn't thick enough so they don't teach it anymore either.


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