Do not apply Bondo or other automatic leveling compounds directly to Styrofoam or foam. As suggested by another user, wood glue would suffice, and yes, once you’ve applied the wood glue you can put whatever you want in it: bondo, fiberglass, epoxy or whatever.
For modeling purposes, Bondo’s density allows it to adhere well to pieces of wood, foam and carbon fiber. These materials are not attacked by the polyester resin, so Bondo can be applied without affecting the surface. It might seem like a bit of a setback, but Bondo doesn’t stick to Styrofoam.
We recommend that you scrape the surface with sandpaper to get the best glue, but after completing the base surface preparation, you can apply gelcoat, resin or epoxy. With Styrofoam or Styrofoam, you can’t apply polyester or epoxy directly to Styrofoam because the foam will melt.
Bondo is a widely used auto body sealant for car and home repairs. You can use the bondo to fill small gadgets and smooth twisted plates into one body. Before applying Bondo, sand the paint, replace the rusty metal and mask the areas that don’t need sealing.
Clean and sand or scrape the surface to prepare it for filling - it won’t stick to slippery, dirty or oily surfaces. Usually if the paint sticks, Bondo will too. Conversely, if there is an area you don’t want Bondo to stick to, use a release agent (see Tools and materials) or use duct tape or wax paper.
Each epoxy is foam proof on all foams. When you say fiberglass resin you are probably referring to polyester resin which is very bad when used on styrofoam. It dissolves it. Polyester has a very strong odor.
The tape is coated with an oily substance to take advantage of this time. Bondo sticks to the ribbon and helps to even out the texture of the ribbons. But it does not take much to tear the bondo of the tape, especially if it is supported by a fall or a bump.
Cardboard is a good base for the bondo if and when it is in a configuration that does not crease when using the finished part or when sanding the bondo.
Urethane foam is a better choice if you want to remove the goat after lamination. It is the easiest to model, and it is the lightest and cheapest. This is what we use for all of our offs. To join the sheets I used Gorilla glue or one of the other polyurethane adhesives which build up a bit.
The answer to this question actually depends on the spray foam used and the spray conditions. Spray foam itself does not rust metal in most cases, but there are lower quality products on the market that can exhibit an acid reaction.
I have used the bondo quite a lot. It usually starts to harden and becomes rubbery within minutes. At this point, you can cut it with a Bondor knife, slicer or rasp. Make sure you release enough until the final sanding, you can usually start sanding within 10-15 minutes.
about 23 weeks
Bondo Ultimate can be applied directly to sanded and cured primers and paints. This filler is easy to shatter after a few days of application.
Bondo is incredibly strong and very easy to work with. The mixing ratio seemed inaccurate, so I went for 8 drops per ounce on wax paper on a plate.
Bondo Fiberglass Resin is designed to repair cars, boats, snowmobiles, jet skis, bathtubs and showers. Bondo fiberglass resin is waterproof and compatible with all paints, including gelcoats and marine paints.
Bondo up to 1/4 inch is no problem. If that’s your pride and joy, I’ll work a little harder to reduce the bulge. Using Metal2metal makes it a little stronger than normal bondo.
Sealants and sealants usually work well on well-sanded OEM paints (80180 grit). But with so many types of aftermarket paints (lacquer, enamel, urethane, water based). It is recommended that all paint be removed from where the sealant will be applied.
Yes, the Mod Podge can be used on Styrofoam. It doesn’t do much just to add performance.