Table of Contents
You need to be sure to add the right amount of hardener to your Bondo; adding more than enough will cause your body filler to dry faster and give you less time for shaping and laying your filler on your panels.
Does Bondo harden without hardener?
Without it the bondo won’t get hard. Put a small piece of bondo on a board and run a line of hardener from end to end. It will take about five minutes to mix it up and apply it. If it starts tacking up, stop applying it or you’ll mess it up.
Does Bondo filler come with hardener?
(Bondo comes with a tube of hardener.) If you add too much hardener, the mixture will gel too quickly. If you add 1 line of hardener across the top of the dollop of Bondo, it takes about 15 minutes to dry after applying.
Does car filler need hardener?
Plastic body filler needs the filler and a hardener mixed at the perfect ratio. The mix is crucial: 50:1. Read the instructions for a clear understand. Its important to note that proper mixing will ensure a consistent, even body filler that will prevent having to redo or repair the area again in the future.
How long does bondo take to harden?
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.
Why is my bondo still tacky?
It could just be the skim on the top that stays sticky. Some lower quality fillers don’t have the additives required to stop that from happening. Try sanding it, if it remains soft and clogs your paper after that first top coat has been removed then you need to take all off.
Is Bondo filler waterproof?
Choose between Bondo Fiberglass Resins, Bondo Fiberglass Repair Kits or Bondo Body Fillers. Bondo Fiberglass Resins and Repair Kits are 100 percent waterproof. Because they do not shrink, they are excellent sealers. Bondo Ultimate can be applied directly over sanded and cured primer and paint.
Can you paint over Bondo without primer?
NO PRIMER! Primer, by it’s very function is ABSORBENT. It SUCKS IN WATER, and will cause RUST and let moisture get into the bondo! Paint it with krylon, or some surplus TOPCOAT, but NEVER primer.
What happens if body filler 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.
Should you primer before 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.
Can body filler be applied over paint?
Can they be applied over paint? A. Evercoat fillers are designed to work over bare, properly prepared substrates such as: steel, aluminum, galvanized metal, fiberglass, and SMC. Fillers and putties will normally work OK over properly sanded (80-180 grit) cured OEM paint.
How long can you leave Bondo unpainted?
Between life and work, the longest time period the bondo would go Unpainted would be about 2-3 weeks.
What temperature should I apply Bondo?
Bondo said: FREQUENTLY ASKED QUESTIONS (FAQ) What is the lowest temperature that body fillers can be used in? 45° – 50°F (7° – 10°C); if using below 65° F, the amount of hardener used should be slightly increased. 12/2/14 4:07 p.m. Bondo says 45-50 degrees.
Is Bondo flexible when dry?
Bondo dries hard, like a sheet rock type texture almost. It cracks really easy, not to mention seperates from its mating surface easy when flexed. For a bumper, Id use some kind of plastic filler, like duraglass or something. It dries like silicon, and it can flex a little.
Can I put Bondo over rust?
Body filler is not good for rust repairs. You cannot slather some Bondo over rust and expect it to stop the rust or stick to it for that matter. If there are holes in the metal, you are much better off cutting it all out, patching it with new metal, and then working the body filler from there.
Can you sand tacky Bondo?
You can go ahead and sand it. If it clogs your paper after you cut through the outside sticky “Film”,,go ahead and strip it off and start over. You didnt put enough hardener in it.
Do you have to prime over Bondo?
Bondo over time absorbs water causing rust to form underneath. It can also shrink over time causing paint to bubble or peel off. If used..the metal must be primed first.
Will Bondo stick to gelcoat?
bondo has a polyester resin base so ya polyester fiberglass resin (or gel-coat) will bond fine.
Can you put Bondo on primer?
A Bondo type of filler, is used for thicker applications, shaping and the like, all the rest is more like primer, the trick for all fillers is to be completely DRY before any type of paint or even primer is put over it, as then it may never dry completely and it then will draw moisture, when it is completely DRY, it Jan 13, 2009.
Do you have to Prime bondo before painting wood?
The bondo must be sanded perfectly smooth before priming, or the texture will show through. After priming, sand the area with 180 grit, then prime again, and sand again. Then your final coat should blend in pretty well, if you have decent paint.
How do you seal bondo before painting?
It’s just that the patches of bondo soak up the primer differently than the metal but epoxy is the way to go. Just let it dry and give the entire truck a light sand with 400 grit and apply a couple more coats of epoxy.
