Removing Bondo.

[walkerlakeprinter]

Is there anything out there that could soften Bondo (or whatever it is). I have 1/8" thick stuff on a very thin and rusty back window panel from my Special Coupe. Some of it pops off easily, but some is really stuck. I'm hoping to clean the piece off, use paint remover, and then sand it to prep for primer.

 

[BRENT in 10-uh-C]

While paint remover will attack plastic body fillers, try using a heat gun first to see if it will release.

 

[cuda]

I've used a silicon carbide disc on my grinder. I LOVE these things. Like this one:

https://www.lowes.com/pd/Gator-Powe...-5-in-60-Grit-Paint-Stripping-Disc/1000346965

 

[Phil Brown]

I've used a silicon carbide disc on my grinder. I LOVE these things. Like this one:

https://www.lowes.com/pd/Gator-Powe...-5-in-60-Grit-Paint-Stripping-Disc/1000346965

X2 on these, they work really good for removing old bondo but they do tend to polish the metal somewhat. Just make sure that the newly cleaned metal has enough surface teeth for the next step in your body work (epoxy primer or new bondo etc.)

 

[Chris Haynes]

Heat the bondo with a propane torch and it will fall off.

 

[Oldbluoval]

Heat, gun back side if you can get to it

 

[77Birdman]

Never tried heat, I assume the heat gun wont warp the metal. I have used paint stripper, let it soak in for a bit and it comes off fairly easy. If its thick will take several coats. In the past I got the stripper from HD, got the best they had cant remember the name off hand.

 

[Mulletwagon]

Propane torch is the way to go.

 

[walkerlakeprinter]

Thanks for all the ideas. After the Independence Holiday I will tackle all my projects. Learning as I go!

 

[whirnot]

I've used a silicon carbide disc on my grinder. I LOVE these things. Like this one:

https://www.lowes.com/pd/Gator-Powe...-5-in-60-Grit-Paint-Stripping-Disc/1000346965

That looks similar to roloc discs. They work great and are quick change.

 

[BN]

X3 on propane torch. Heat a small section (on the underside if accessible) just enough so that it peels off with a putty knife. Move to another section some distance away. Keep feeling the panel with your hand so it doesn't get too hot. This is what I did with zero panel warpage.

 

[Oldbluoval]

I’d worry about warpage with a torch
Heat gun generally won’t get hot enough to warp
But experience and skill would preclude likely

 

[Kurt in NJ]

Twisted knot stiff wire wheel on a grinder does good and won't bother good metal