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Found me a cheap alternative to bondo.
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IG-88:
I had some corners to fix on my Hyper Sports cab and didn't want to go buy a $20 bucket of bondo that I don't really like anyway so I used what I had.

Water putty mixed with a 50/50 water and Elmers wood glue made these corner repairs a snap.

And what I really like about it is the stuff dries brick hard. So hard in fact that I had to use a hand grinder to "get it close". The palm sander would've taken forever. Made a nice t-mold grove too. With bondo I usually get it chipping out or breaking apart all together. So far this holds pretty good.

And as another bonus, the putty/powder was under $2 for a pound and the glue about $4.5 a bottle. Bondo still may work for larger areas but I won't be using it. If it's that large I'll just replace the wood itself.

Here's a couple pics:
bkenobi:
I've used this stuff a couple times myself.  It does to a great job of creating a strong surface that can be sanded.  HOWEVER, it is not a very good product to use for primary structure!  I did a corner repair with this stuff and found that the product will break off in a chunk where it bonds with the wood (particle board).  The solution I came up with was to use a piece of MDF for structure and use this stuff to make the joint seamless.
drventure:
@bknobi Did you mix with Woodglue?

Just curious as to whether that would help the adhesion to the MDF.
IG-88:
I believe that using this stuff in conjunction with the CARPENTERS GLUE makes a very solid structure. It's held up better to my hand grinder and the router than bondo. If I had a larger area to fix I would definitely use solid wood, like I also said.
Bender:
Great Idea
What's the dry time?
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