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Add 1 line of hardener–also known as a catalyst or fixing agent–by squeezing it out of the tube across the top of the Bondo filler. (Bondo comes with a tube of hardener.) If you add too much hardener, the mixture will gel too quickly.
What is the ratio of Bondo to hardener?
Place the proper amount of Bondo filler and hardener: 50:1. First, place the filler on the mixing board and then place the hardener. 3. Mix with a plastic or metal Filler Spreader.
What happens if you use too much hardener in body filler?
If you see streaks of filler or hardener, keep mixing. Adding too much hardener will result in rapid gelling of the mixture, making it hard to get coverage in time. Too little hardener will increase cure time, but there’s a point where the filler won’t ever harden and you won’t know it until you try to sand.
Do I need to add hardener to Bondo?
How Much Hardener Do You Add To Your Body Filler? 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.
Can you add too much hardener to 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.
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.
How do you mix Bondo fiberglass resin and hardener?
Mix the Bondo® All Purpose Fiberglass Resin in a paper cup with the Bondo® Fiberglass Resin Hardener. For small applications use 10 drops of hardener per ounce of resin. Working time will be 10 to 12 minutes. For larger applications, use half of the fiberglass resin hardener supplied, to half of the resin container.
What grit sandpaper do I use for Bondo?
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). AutoBodyNow.com sells a vast assortment of sandpapers and sanders to complete this step.
How thick can I apply Bondo?
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.
How long does Bondo take to harden 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.
Why is my Bondo sticky?
Sticky, tacky resin: This is often caused by inaccurate measuring, not mixing thoroughly or by curing in cold temperatures. Try moving your piece to a warmer spot: if it doesn’t dry, re-pour with a fresh coat of resin. Scrape off any liquid resin as best you can and pour a fresh coat.
How long does it take Bondo body filler to dry?
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.
What is Bondo hardener made of?
This hardener is mixed with polyester fiberglass resins to create extremely strong, durable and waterproof repairs. Once mixed, the fiberglass resin will cure in approximately 2 hours.
How long does filler take to dry without hardener?
Once the resin will eventually run out and atmospheric oxygen will participate to harden the wood filler even without the hardener. But this process will take 2-3 years to complete. Because resin does not run out that quickly without having a hardener.
What is liquid hardener used for?
Liquid Hardener mixes with Fiberglass Resin and Bondo Metal Reinforced Filler to create high-quality, long-lasting repairs. When hardener is mixed with product, a chemical reaction occurs to create a mixture that will deliver a strong, lasting repair. This hardener is also easy to mix.
How much hardener do I mix with resin?
Mix the resin VOLUME – To achieve the correct 2:1 mix ratio by volume, simply measure out 2-parts resin to 1 part hardener before mixing the components.
Is Bondo fiberglass resin epoxy or polyester?
Product Description. Bondo Fiberglass Resin is a strong material commonly used for autos, boat building and other repairs. This high-strength polyester resin can be used with fiberglass mats or cloths on surfaces including fiberglass, wood, metal and masonry to repair metal rust-outs and to recreate or join surfaces.
How do you mix Bondo fiberglass jelly?
Needs mixing instructions 1 oz. tube hardener for whole 16 oz. can of jelly. It should say something like squeeze out 1/2 inch of hardener for every ounce of jelly.
Should you prime 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 you put body filler on Baremetal?
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.
