Does epoxy resin melt Styrofoam?

Asked By: Buck | Last Updated: 5th January, 2020
Category: hobbies and interests needlework
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With Polyurethane foam, it will easily withstand Polyester or Epoxy resin applied to the top of it without having to do anything special. With Polystyrene or Styrofoam, you can't directly apply Polyester or Epoxy directly to Styrofoam, as it will melt the foam.

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Moreover, can you use resin on Styrofoam?

Polyester resin cannot be used to coat styrofoam because the styrene part of it will eat into the surface. However, polyester resin will work perfectly on polyurethane foam and, with predictable logic, polyurethane resin works perfectly on polystyrene foams such as styrofoam!

Also, does resin melt foam? Any epoxy resin is foam safe on all foams. When you say "fibreglass resin" I assume you mean polyester resin which is very bad when used on polystyrene foam. It melts it. Polyester is the one that smells very strong.

Thereof, can you mix epoxy in Styrofoam?

2-part epoxy is good for gluing things to styrofoam. Epoxy generates heat while curing, so use it in as small amounts as possible. dedStik 10:03 AM Apr 23, 2012. Or let it sit in it's mixing container until some of the heat bleeds off, but before it half cures.

What can you spray on Styrofoam to make it hard?

Hard Coating the Styrofoam

  • Spread out your drop cloth in a clean, well-ventilated workspace. Put on a pair of protective gloves.
  • Mix the liquid polyurethane together.
  • Load your paint brush with the polyurethane.
  • Brush between two and four total coats of liquid polyurethane onto the Styrofoam surface.

35 Related Question Answers Found

Will Bondo melt Styrofoam?

This may sound like a bit of a downer, but Bondo does not stick to polystyrene. Further, the resin also breaks down the material and eventually melts the polystyrene. In fact, some grease monkeys apply Bondo to the bottom of Styrofoam cups before applying it to various car parts.

Will epoxy resin eat foam?

Epoxy shouldn't eat the styrofoam. "Polyester resins" that are used most of the time with fiberglass will eat up styrofoam but the epoxy shuldn't.

Can you use Mod Podge on Styrofoam?

Yes, mod podge can be used over styrofoam. It doesn't really do much on it's own to add strength.

Will fiberglass resin melt plastic?

My understanding is that polyester resin (like cheap "fiberglass resin" from the hardware or auto store) will eat styrene plastic, at least if the plastic is thin. Epoxy won't, but doesn't make a chemical bond. That's why you need to scuff it well---you're relying on a mechanical bond.

Can you seal Styrofoam?


If you apply regular paint to Styrofoam without sealing it, it will eat away at the foam and cause it to melt. Properly sealing the Styrofoam first prevents this problem and gives you a relatively smooth surface to paint on.

What kind of foam can I use with fiberglass?

Urethane foam is a better choice if you want to remove the buck after laminating. It is the easiest to shape, and is lighter and cheaper. That is what we use for all of our one offs. To attach the sheets together I have used gorilla glue, or one of the other polyurethane glues that foam slightly.

Does epoxy eat through plastic?

Typically, traditional epoxy doesn't adhere well to many plastics due to a lack of surface texture for a mechanical bond. With some plastics, the epoxy forms beads on the surface like water on a waxed finish. But with proper surface preparation, it is possible to achieve excellent adhesion to many plastics.

How do you make epoxy hard?

Pro Tip: If you want your epoxy resin it to cure harder. While mixing, let it induct heat in the container until it hits 93 degrees. For an accurate temperature, just use an infrared heat gun or you'll feel the cup start to get warm in your hands.

Can you mix epoxy in glass?

Dispense the proper proportions of epoxy resin and hardener into a clean plastic, metal or wax-free paper container. Don't use glass or foam containers because of the potential danger from exothermic heat build-up. DO NOT attempt to adjust the epoxy cure time by altering the mix ratio.

Can you mix resin in a paper cup?


50 Graduated Paper Cups
Perfect for mixing small batches resin, paint, stain, epoxy from 1 to 3 ounces. Cups are are wax coated. They are sturdy and smooth on the inside to help with complete mixing. They are flexible enough to make pouring easy.

Can you mix epoxy in a plastic cup?

Plastic Cup Meltdown – Working with Epoxy. To waste as few as possible epoxy resin, I used very small plastic cups for dipping. The exact material of this plastic cups is very important I learned. You should never use something which will react violently with the mixed epoxy resin, as you can see in the next picture.

Is epoxy foam safe?

It's perfectly safe on EPP and EPO foam, however. And in my experience, epoxy doesn't bond well to EPO. These days I use Gorilla Glue a lot -- it bonds to any kind of wood or foam. Make sure when you glue to foam , roughen it up with sandpaper as some foam still has a foam release agent on them.

What is epoxy foam?

FOAMING. Sicomin is the original formulator of a range of expanding foaming epoxy systems that have been developed specifically for the manufacture of strong, high quality structural cores and also used for the bonding of laminate skins made of epoxy, polyester or vinylester resins.

What is foam resin?

Foam Resin Systems. Alchemix Polyurethane Foam Systems consist of rigid foam products with differing free rise density for models and prototypes and also self skinning flexible foams with a variable mixing ratio to achieve different levels of flexibility.

How do you melt fiberglass?


Heat the fiberglass with a heat gun, blow torch or iron. Place the heat source close to the fiberglass and move it slowly across the surface. This heats the resin beneath the fiberglass. It breaks down, allowing the fiberglass to be stripped.

Does epoxy work on fiberglass?

One reason that an epoxy product such as WEST SYSTEM® Epoxy is so useful for fibreglass boat repairs is that it's an incredibly effective adhesive. It creates a resilient bond to fibreglass, cured polyester laminates, wood and metals – even when you only use a thin film.

What can dissolve fiberglass?

Ethanol. Some storage tanks are made using fiberglass. Ethanol can cause the resin to dissolve if placed into a fiberglass tank with a polyester resin. Ethanol is sometimes mixed with other chemicals, so the fiberglass dissolving can be unexpected.