Q. What is the mixing ratio for body filler and cream hardener? A. Use a golf ball size amount of filler and use 5-8 drops of hardener or about and inch and a half strip of hardener.
Will Bondo harden without enough 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.
What happens if you put too much hardener in body filler?
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.
Will fillers set without hardener?
Does Wood Filler Harden Without Hardener? No, the wood filler does not harden without adding a hardener. The hardening process happens due to a chemical reaction between the wood filler and the hardener which is also known as the catalyst.
How thick can you 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!
Should Bondo be applied to bare metal?
NO, never. bondo goes over bare steel only. Never over any kind of paint, primer, etc.
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.
How do you mix fiberglass Bondo?
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.
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.
Is all body filler hardener the same?
thanks. Almost all body filler hardeners are the same, either red or blue and some jobbers also sell white. The one hardener that is different is the one the comes with Quantum 1 filler, it’s much slower than standard hardeners.
How long does Bondo take to harden?
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.
What grit sandpaper do I use for Bondo?
Directions for Use
If grinding is needed use a 3M™ 36 or 40 grinding disc followed by 3M™ 80 grit sandpaper if no grinding is required, sand the surface with 3M™ 80 grit sandpaper to remove all primer, paint and rust 1 to 2 inches beyond the outer edges of damaged area. Remove all dust created from sanding.
How long should Bondo set before sanding?
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.
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.
