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Can I powder coat over Bondo?
Powder Coating over Bondo will cause outgassing to occur, this will create irregularities in the finish. Generally, any metal fabrication that has Bondo on it could be rejected by your custom coater. If a filler is needed and there are no other options, then we recommend a high temp filler such as Alvin鈥檚 Lab Metal.
Can I use Bondo as a wood filler?
I talk a lot about how to repair damaged wood on this blog because old houses get a lot of it. There is one thing I have been adamant about and that is not using Bondo as a wood filler, because it鈥檚 not made for that. Instead, I advocate for actual wood fillers and epoxies that were designed for wood not the auto body shop.
Does Bondo hold moisture?
Bondo is also well-known for holding moisture; the problem is that it does so without release. And just as moisture can become trapped between metal and Bondo when performing auto body repairs, it can likewise develop between wood and Bondo.
Does Bondo stain?
Another thing that isn鈥檛 a big deal if your painting, but just so you know Bondo does not stain well鈥t all. It is largely impervious to water and oil-based stains so your patch stands out like a sore thumb. Trying to overcome this will only yield two different colors on your surface that serve as obvious indications you鈥檝e made repairs.