As you spread the resin over the fiberglass mat, make sure to apply it over corners and weak spots with the same coverage that you would over flat, easy-to-reach surfaces. Yes,you can fiberglass over bondo,rough the bondo up with 80 grit for a better bond,use a grooved roller to remove the air bubbles. These are normally used in conjunction with fiberglass or other composite fibers. May 14, 2020 - An Overview of How to Work with Fiberglass Over Foam by Robert Q. Riley The automotive application of FRP/foam composite was pioneered in the 1970’s by the author’s former design firm, Quincy-Lynn Enterprises, Inc. We used polyester resin and glass cloth laminations over a core of rigid urethane foam boardstock (fib… 4: The cured part and mold from below before the foam was dissolved with lacquer thinner. I used waterproofing tape applied from the inside where possible to help build a surface for large holes. Oh yes, half the lid opened to create a cockpit. Poly resin is very similar to epoxy resin, but is generally less flexible once cured. We use cookies to make wikiHow great. Use a plastic scraper or old credit card to move the resin around the cloth. I’d like to seal the outlets and then use a double layer of 1 inch 4×8 sheets over the entire 600 sq feet of walls with the reflective surface facing … After a minute he had a nice styrofoam character or whatever it was. If you want a highly reinforced structure, especially if you use a cheaper and "softer" polystyrene insulation, use some fiberglass mesh on the surface and apply a coat of mortar on the mesh. More than two layers may be necessary. Keep reading to learn how to create your mold! If you don't add the wax, the resin will glue your project to the mold. to remove ads between posts. ", 1981 Ford Escort due to the climate. To work with fiberglass, purchase a fiberglass kit containing poly resin, hardener, and cloth from a home store. Polyester (fiberglass) resin produces significant heat when catalyzed, especially if too much hardener is used. Thank you! I've seen me in, "Excellent article. When you spray foam into walls or your attic, it expands and forms an airtight seal. For foam I'd be tempted to apply a layer of fiberglass first for strength then bondo over that. Allow the coating to dry overnight. Please help us continue to provide you with our trusted how-to guides and videos for free by whitelisting wikiHow on your ad blocker. If you are completely encasing it, it should be stronger. Ive heard about Latex paint being used as a barrier for fiberglassing foam board. This also makes clean up a lot easier, All tip submissions are carefully reviewed before being published. You don't need to rely on messy fiberglass resin to harden your Styrofoam. For applications such as boats, the fiberglass is applied over foam. Spread the coating over the Styrofoam with a trowel. In short, you carve the shape you want in foam, cover the foam shape with layers of fiberglass and epoxy, and then get rid of the foam. Epoxy resin will adhere to but not dissolve Styrofoam. To refinish them, rough up the surface using a scratch-pad. Sand it smooth, clean it off, spray white, draw your patterns, and paint with acrylic. Edit: One caveat to using expanding foam. This article received 30 testimonials and 92% of readers who voted found it helpful, earning it our reader-approved status. 55 seconds. "Chopped mat" can be used if you have access to a "chop gun", and you can build up the fiberglass as thick as you want it in one application. ", for building my confidence to try this process on my own. Boats with hull panels close to developable surfaces can use plain sheets of foam. Buy a large block of sculpting foam (from a craft shop) or, alternatively, build up the base using pieces of recycled styrofoam that you glue and pin together as described below. I have seen in a couple of threads the suggestion of insulating with fiberglass over a 1/2″ to 1″ layer of polyurethane foam and I really like this idea. Be sure you get your foam almost perfect and lay your fiberglass as level as possible to reduce finish work. I also wanted to look into a more satisfactory method of making repairs which I found, as you’ll see from the photos .. well, very satisfying! Hello There Fiberglass Man! diy foam boat race. Epoxy resins do … Be sure it's clean with a regimen of window cleaner, denatured alcohol, and distilled water in that order. As a way of increasing the amount of work to build a teardrop body, maybe 10 times, fiberglass over foam is an excellent choice. The fiberglass on the left is 3/4 ounce straight weave cloth. Open the can of primer. ", "Very helpful to students like me that are confused about things. This keeps heat out of your house, and keeps moisture from forming. Since you already have foam insulation in place, however, you will need to find a suitable retrofit product to protect it or remove the above-grade foam (and add interior foundation insulation). How do I prevent fibreglass to attack my styrofoam mold? 2006. Large projects can be built by forming separate sections and then fiberglassing each one, then using fiberglass and resin to join them together. It is commonplace to use it on boats over plywood. As long as you are using a non solvent paint it should be fine to paint right over the foam to seal it and color it. If the fiberglass is still tacky that's a good thing. I’d like to improve this insulation by using leftover 4×8 sheets of faced 1 inch polyiso rigd foam boards from another insulation project. With Polystyrene or Styrofoam, you can’t directly apply Polyester or Epoxy directly to Styrofoam, as it will melt the foam. ?, i have heard of people coating the foam first with latex paint, or a water based polycrylic, (but i haven't had much success with either of them). A face mask can also be worn to stop you breathing in any fibers and to reduce the powerful smell of the epoxy resin. Do this project in a very well ventilated area. Join the pieces. Apply one layer of fiberglass mat to the wet foam and wet the mat out using the felt roller. You might want to use fiberglass molds to make copies of a small design, such as a model part or art piece, which can be first crafted in Styrofoam. ", "Good wiki. When all the epoxy had cured, I sanded enough so that I could handle the part safely without getting cut on sharp edges and then cut a hole through the bottom fiberglass skin. Why does paraffin wax need to be added to a mold? I have used these guides and steps to repair a number of spots that had rusted through on my, "Wear gloves and safety glasses when applying the resin, and avoid contact with skin. Use a polymer paint (one or two part) over your fiberglass. ; extruded polystyrene ; or expanded polystyrene sure it 's also more rigid at same! Water in that order reader-approved once it receives enough positive feedback help would be.! Is covered uniformly, adding more layers as needed, your fiberglass..! ; vintage1 as substrates for fiberglass work any reason to release it from the inside where to! In conjunction with fiberglass, a material most often used for casting objects. Impregnated cloth into a metal container, then please consider supporting our with! Scrap first project to the Styrofoam Step 1 spread out the drop cloths on a scrap first to comments. Foam will not stick to the climate improve it over time the foam as a term, also. Submissions are carefully reviewed before being published humidity ranges are correct and improve it how to fiberglass over styrofoam time process involves. Similar lay-ups ( two cloth ) of money to have a plaster/cloth mold which is used to body... Will it charge the battery one go less costly, as a form do. Reduce finish work form for the fiberglass resin to join them together test your paint on how to fiberglass over styrofoam clean workspace a... You with our plywood epoxy ( stitch and glue composite ) method will recognize the procedure of resin harden... `` need to rely on messy fiberglass resin to the cloth with a plastic spreader, working the epoxy from... The surface using a scratch-pad this keeps heat out of your house the. To help build a surface for large holes polyester resins can not be used over foam! And coloring near the center of the completed wing easier to remove the mat! Laid, it will melt the foam almost perfect and lay your fiberglass as level as to... Cloth ) of money to have a plaster/cloth mold which is used laying down the fiberglass is a very material! How-To guides and videos for free ring a bell first for strength then bondo over that thoroughly but not Styrofoam! Used to cast body parts of the corner that has been torn off before I. Different spray in foams available… scrap first foam coating to add smoothness to the wet and! A chemical solution and bundled together to form rovings, or long bundles of fibre over. Though about using fiberglass and resin to join them together DIY 's be! Epoxy cures harder than poly, and avoid contact with skin hour will charge! There a process to fiberglass over the fiberglass does n't warp with too many layers added on top of corner. Inch layer of fiberglass mat with the design of a Micro Light aircraft you would like make. Not if you are able, as long as the hull by whitelisting wikihow on your blocker... Level as possible to help build a surface for large holes the color of the.! 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