Re: How long does Bondo last?

Posted by slughammer on August 24, 2001 at 07:29:30 from (12.13.248.4):

In Reply to: How long does Bondo last? posted by Alan Farley on August 23, 2001 at 20:32:42:

The tip for mixing bondo is to use a golf ball size amount of the bondo and about 1 inch of the hardener to get the right mix. Try this amount, mix it well and let it set to the side. Check the sample for hardness and make sure it is not tacky. Get the hang of mixing a small amount and then try for the same results with larger batches. Bondo jobs in eastern PA last about 2 years until the metal around them rots out from the inside again. The main problem being moisture and your main goal is to protect both sides of the metal from it. Your top coat of paint will protect the outside, (primer is NOT a topcoat). The inside is where the problems will begin, Bondo is a talc based product and will attract and hold moisture and your truck will rot from the inside out. For your application find a fiberglass based product, I have used a product called MAR-GLASS and my second repair to my quarter panel has lasted about 8 years now and it is just showing signs of problems. The fiberglass based fillers do not hold moisture like the talc based ones. They are a little harder to work with after they harden, but the results are worth it. Now you need to plan on having no bare metal on the back side and no bare edges either, but with a hole large enough you should be able to clean the area with solvent and smear some of the filler to the back side of the area overlapping the paint and smoothing it out to form a tight seal to protect the good metal. Don't worry about getting it all filled in one step, a few layers may be necessary. When you are done with the outside, topcoat over the primer is a must (primer will not protect you from moisture). Good Luck - Slughammer

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