Quick Answer: HOW LONG WILL Body Filler Last?

Will Bondo fall off?

There is no minimum thickness for Bondo, but there is absolutely a maximum.

You do not want to apply body filler to anything that is thicker than about a 1/4”.

That does not mean it can’t be done, but the repair will not last as long.

Eventually the filler will shrink and possibly crack or even fall off..

Is it OK for Bondo to get wet?

the moisture will be trapped between the metal and the bondo. something about it yes the bondo will dry out but it traps just enough between the two to cause problems most likely way down the road. there is something about it that makes it harder for the moisure to escape than it was for it to get in.

What will Bondo not stick to?

Clean and sand or scuff the surface to prepare it for body filler — it will not adhere to smooth, dirty or oily surfaces. Generally, if paint will stick, so will Bondo. … Conversely, if there’s an area you don’t want Bondo to stick to, apply a release agent (see tools and materials) or use Scotch tape or wax paper.

Why did my Bondo crack?

It cracks because of either it is to thick or the panel was not prepared properly. Don’t fear bondo though. It can be used properly and will not fail if it is done right.

Can I put body filler over primer?

Can you apply body filler or bondo over primer filler? Yes. … You CAN apply over sanded 2k primer, or bare metal. Be sure to have the area sanded with at least a 150 so the filler has some TOOTH to grab to.

How can you tell if Bondo is bad?

Re: What’s the shelf life of Bondo and hardener if it was cold for any long length of time, the hardener separates and goes bad. No matter how much kneading you do it never seems to mix again. age can affect it too. if it has been sitting around for a long time (year or more) it can go bad.

How do you fix a bad Bondo job?

Grind all the paint and bondo off that area and see if it’s a pop riveted patch, or bubbling rust, or who knows what. Then a proper fix will require removing ALL of the rust and buggers, and welding in a solid repair. Then properly hammering it to shape, and a skim coat of filler, then paint.

Do body shops use Bondo?

Yes auto body shops still use Bondo and other fillers. It is a great product and if used properly, thin applications, it works great. Most Bondo problems are due to excessive thickness and improper application. … Can most car repairs still be done by an untrained mechanic?

Does auto body filler go bad?

All body filler comes with some sort of date coding (i.e. “Best if used by December 2000”). … In a heated storage room, the polyester body filler will last several years. It’s just the hardener that goes bad. Paste hardener should be kneaded in the tube to reach a smooth uniform consistency every time before it’s used.

Why is Bondo bad?

Just be careful. Bondo will not stop rust so if it is used to cover an area without the proper prep work the panel will continue to rust from the inside out. Even if you watch the big shots on TV restoring a car, they will use a skim of body filler or putty over the entire car and block it all smooth.

Does acetone remove Bondo?

Acetone will remove at least some fabric alongwith the embedded Bondo. … According tothe Aftermarket Product Department of 3M, the Bondo shouldrelease from the fabric fairly easily.

Should I prime before body filler?

Before adding any filler, you should get the metal fairly close. … For small repairs, you can bog directly over the bare metal. If the repair is larger, or you’re looking for a longer-lasting job, apply a base coat of epoxy primer before laying on the filler.

Can I apply body filler over epoxy primer?

Applying body filler over epoxy primer provides maximum corrosion protection for the metal. Apply filler within seven days of applying epoxy primer to maximize adhesion. OPTIONAL: Scuff Epoxy with P120-P180 grit sand paper or red scuff pad. … 2 Mix and apply body filler over epoxy.

How long can Bondo be stored?

16 monthsWhen stored at the recommended conditions in original, unopened containers, this product has a shelf life of 16 months from the date of manufacture.

Can you thin Bondo body filler?

Polyester resin can be used to thin bondo, however by reducing the ratio of fillers to resin, it will increase the amount of shrinkage on cure.

Can body filler go over paint?

Fillers and putties will normally work OK over properly sanded (80-180 grit) cured OEM paint. However, with so many different types of aftermarket paint available (lacquer, enamel, urethane, water-based). We recommend that all paint be removed where filler is to be applied.”

Can you use old Bondo?

If it is a few months old it should be fine. just mix it up real well. Go ahead and use it, it will definitely be fine. The hardener does wear out.