How do you mix Bondo glass filler?

What type of hardener does Bondo glass use?

Bondo® Red Cream Hardener

The filler is easily mixed using the included Bondo® Red Cream Hardener, designed specifically for use with Bondo® fillers. It also features a fast-drying formula that is sandable in as little as 20 minutes, saving you time on auto body repairs.

How much Bondo do I mix?


Quote from video: So we're gonna just mix that up quick and we're gonna put a little bit of bondo. On it my dad says for every golf ball-sized of bondo you want to put about five to eight drops of your hardener.

What is the ratio of filler to hardener?

The correct hardener to filler ratio = 3 inch diameter circle 1/2 inch thick of filler to a 3 inch strip of cream hardener. 3. Mix the body filler and cream hardener thoroughly, to a uniform color.

How do you mix Bondo fiberglass filler?

Open the can and mix the Bondo with a stir stick if there is a layer of liquid on top. Use the stir stick to lift a golf ball-sized dollop of filler out of the can and reseal the can. Mix a larger amount of Bondo and hardener if the area you need to patch is larger.

Can you use liquid hardener with Bondo glass?

Use with Bondo Fiberglass Resin to aid in repairs and add extra strength. Used as part of a 2-part system, the liquid hardener is mixed with fiberglass resin to create strong, durable and waterproof repairs.

What is the difference between Bondo glass and body filler?

Bondo-Glass is a unique reinforced filler containing short, interlocking fiberglass strands and fibers that make it twice as strong as regular body filler. Repairs small (dime size or smaller) rusted-out metal holes and shattered fiberglass body parts.

What happens if you put too much hardener in body filler?

Over-catalyzed filler (adding too much hardener) also will cause an excess amount of pinholes because of the heat generated by the catalyst. A thorough application of body filler can be achieved in one application.

What happens if Bondo is too thick?

Thickness Matters



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!

How do you use Bondo for beginners?

Quote from video: With the filler and hardener evenly folded together start applying it to the hood. Remember. You only have about three minutes before the filler set. So work quickly first apply a thin coat.

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 do you calculate filler to binder ratio?

The filler-binder ratio is calculated by dividing the percentage by mass of filler in the combined aggregates by the percentage by mass of binder in the mix. This investigation found that the filler-binder ratio has some influence on workability, but on its own is misleading.

How thick is too thick body filler?

So in the spirit of political correctness and repeating the party line ” Ideally filler should never be more than 1/8″ thick “.

How long does it take for Bondo glass to dry?

It also features a fast-drying formula that is sandable in as little as 20 minutes, saving you time on auto body repairs.

Should you pour hardener or resin first?

Start by pouring 15 oz of resin into the measuring cup, followed by 15 oz of hardener, to give you 30 oz total. The 32 oz kit is the perfect amount for your project’s needs.

Can you put too much hardener in fiberglass resin?

Quote from video:

Are all Bondo hardeners the same?

All the different color hardeners are chemically the same, just different color dyes. One color is not going to work any better or worse than any of the other colors. And those hardeners don’t freeze (at least here in Freeze Your Nads, Michigan) where 10 below zero is not out of the ordinary.

Can you use any hardener with Bondo?

Unfortunately, the answer is no. The hardeners made for Bondo are the only products that can help Bondo dry and cure on a surface.

Does Bondo glazing and spot putty require hardener?

Mistake-free and does not require hardener. Fills pinholes, scratches and other imperfections. Cures in minutes and is easy to sand.

Will fiberglass resin hardener work with Bondo?

This hardener — a crucial component for use with Bondo Fiberglass Resin and Bondo® Metal Reinforced Filler — is another way that 3M applies science to life, and helps you restore and maintain the beauty and value of your cars, boats and other possessions in and around the home or shop.

What is stronger fiberglass or Bondo?

Fiberglass is More Durable than Bondo



The first key difference between these two is in regards to durability. Fiberglass is way stronger than Bondo resin. Therefore, when you use fiberglass filler, expect it to outlast car parts that have Bondo.

What happens if you add too much hardener to fiberglass resin?

Adding too much of either resin or hardener will alter the chemical reaction and the mixture will not cure properly.