best body filler

[usmcchevy]

what is the best body filler to use on bare metal. what will stick the best and not pop off in the future like cheaper bondo. thanks for any help.

[BruceLopesJr]

They're all the same.  Quality will depend on prep work, the amount of hardener used, and the paint work after.  

Biggest mistake I see is people do the body work then prime the vehicle, but don't paint it.  Primer lets water through and it gets behind the bondo, causing the metal to start rusting again.  Paint seals out water, which will allow the bondo to adhere to the metal longer.  

[Blazin]

They all stick about the same with proper prep work, but some spread easier and don't pin hole as much. I like Dynatron yellow, also I always put my first coat on with short strand fiber glass filler then step up to body filler. The glass is stronger and is water proof. On my last coat of filler I mix a little bit of polyester fiber glass resin ( the stuff you use with cloth ) with the filler make it spread like warm butter, just use regular hardener, fills in pinholes nicely. Don't use glazing putty, it shrinks after a while and pulls scratches though the paint. Use a urethane primer with an activator.

[79 4x4]

I like bondo-glass, works pretty good, even use it on my fleet of dumptrucks, if preped right it even stands up to the abuse that the dump bed goes though.