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Allow the putty to dry 15 minutes at 77 degrees F (25 degrees C). In cooler climates, putty may take 20-30 minutes to dry. 7. Using 3M™ Sandpaper 80 grit, sand and shape the filled area to the contour of the surface.
Do you have to sand Bondo right away?
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.
Do you sand Bondo between coats?
Between each coating, sand the hardened putty with 80-grit sandpaper to remove excess Bondo. The coarse sandpaper will also rough up the surface giving it the tooth needed for the subsequent coating of Bondo to achieve good intercoat adhesion.
How long can Bondo be left unpainted?
Between life and work, the longest time period the bondo would go Unpainted would be about 2-3 weeks.
Do you wet sand Bondo?
Don’t wet sand filler. Filler is too absorbant and you can have problems getting it dry plus you could cause moisture to wick through to the metal or weaken the bond between the filler and the substrate.
How long does Bondo take to dry without hardener?
That said, having an idea of how long bondo takes to dry is important whenever you’re planning out a project or repair. When used according to the manufacturer’s recommendations, Bondo takes 10 to 15 minutes to dry enough to form a sandable surface. After 45 minutes it’s cured enough to be painted.
Can I apply second coat of Bondo?
NEVER apply filler over unsanded cured filler. If the first batch is even starting to set up, let it go, sand it then reapply.
What grit sandpaper do I use for Bondo?
First step: Prep the Surface Before applying, paint needs to be sanded to the bare metal. 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).
Do you need to prime over Bondo?
You should use a “direct to metal” (DTM) primer to help top coats stick to the metal but it’s not needed under body filler most of the time. Once the metal is primed then you can apply a “filler primer” (2K) to help hide scratches and minor surface irregularities.
Can you put Bondo over sanded paint?
Fillers and putties will normally work OK over properly sanded (80-180 grit) cured OEM paint. We recommend that all paint be removed where filler is to be applied.”Nov 3, 2012.
Is Bondo waterproof?
Bondo Fiberglass Resins and Repair Kits are 100 percent waterproof. Because they do not shrink, they are excellent sealers. Bondo Fiberglass Resin is sandable in less than 2 hours, is compatible with all paints, and creates a strong and long-lasting bond.
Does body filler absorb water?
If you check the MSDS on these products you will see that they still have talc, just like “regular” fillers and WILL absorb water. John, you really shouldn’t be applying that Picklex around the filler, it is bound to get under it and cause big problems.
Does body filler absorb paint?
Does Bondo Stick To Paint? It is normal for filler and puttie to work OK over OEM paint that has been properly sanded (80-180 grit). Paint should be removed from the area where filler will be applied before it is applied.
Does car body filler absorb water?
The filler itself is a complex mixture of goop that contains, among other things, fiberglass (polyester) resin and talc. Talc is hygroscopic (that is, it absorbs moisture) unfortunately, and that’s the reason fillers absorb water. The main solvent in the filler is styrene, which vaporizes as the mixture cures.
What happens if you put too much hardener in Bondo?
If you add too much hardener, the mixture will gel too quickly. If you add too little, it increases the amount of time for it to cure, and if you don’t add enough it will never cure. If you add 1 line of hardener across the top of the dollop of Bondo, it takes about 15 minutes to dry after applying.
Will filler go off without hardener?
The resin which is included in wood filler prevents the hardening by itself without hardener. Once the resin will eventually run out and atmospheric oxygen will participate to harden the wood filler even without the hardener.
How thick should Bondo be?
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 pop off!Feb 2, 2020.
Can you apply body filler over body filler?
Do not proceed to Primer Filler stage until filled area is even. Adding body filler AFTER primer filler should be avoided to prevent possible adhesion, staining and shrinkage concerns.
How much hardener do you put in Bondo?
Mixing is the most vital step when using body filler. Plastic body filler needs the filler and a hardener mixed at the perfect ratio. The mix is crucial: 50:1.
