Can car fillers get wet?
Also know, are car fillers waterproof?
No car body filler is waterproof as it is polyester resin with a fine binding powder to make it into a paste, there are similar products which are waterproof but not used as car body filler.
Additionally, can Bondo get rained on? Well, the all metal fillers (under your bondo) don't absorb water to the extent that regular bodyfiller will, but believe they still do absorb some. Plastic filler absorbs it like a sponge, but keeping some heat on it should eventually evaporate the water from the plastic filler.
Besides, what happens if Bondo gets wet?
If you got some bondo wet and then dried it out, you could grind it down and it wouldn't have any moisture inside, but the metal behind it may have already been oxidized and then you'll have problems.
How long does car body filler take to dry?
Bondo mixed to the color swatch will begin to cure in less than 10 minutes at room temperature. Too much hardener in a warm environment will reduce working time, but too little in a cool environment can result in maddeningly long curing times.