How To Sand BONDO For Primer – Do It Yourself Paint And Body "FOR BEGINNERS"

Hand sanding bondo for the final preparation to spray primer on the car. Body Filler is a tricky thing to work with unless you know the right way to do it. Paint and body for automotive repairs takes practice and patients.
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What grit sandpaper do I use to sand Bondo?
First step: Prep the Surface

Make sure to sand outside of the repair area as Bondo will need to be spread and applied wider than the damaged area. (36-grit to 220-grit should do the trick for body filler application).

Can You Sand Down Bondo?
Cut and sand

Once the Bondo cures, it’s time to sand. Power sanders are OK to break the surface and knock down any high spots, but hand sanding with the body contour is the best way forward. Cut in with heavier grit sandpaper and work out to about 80 grit to leave a tooth for the following skim coats.

Does Body Filler Go Bad?
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.

Is Bondo Toxic After It Dries?
Applying Body Filler / Bondo

As the filler dries, styrene is released to the air and you can breathe it. … Exposure to styrene can cause respiratory irritation. It may also damage your liver and possibly cause cancer at very high levels of exposures – not usually found in autobody shops.

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