Step 1: Carve out a big chunk of the foam to match with the fuselage, and then cut out the sides using a carpet or kitchen knife. A plug for a fiberglass or composite mold is typically a representation of the finished part, and can be an actual part or a mock up of a part. Lay two 2-by-4s, 8-feet long, on top of the sawhorses to create an 8-foot work space. Drill 1/4'' holes in all of the flanges for the bolts. That way the latex rubber won’t absorb into it making it tougher to peel off after your mother mold (fiberglass shell) is done. You can easily make a mold with air-dry clay by hand. One of the primary keys to success in mold construction is proper preparation of the plug. Sand gently until you can see the line between the mold and the plug. Often the mother mold serves another purpose as well, that of containing the liquid rubber while it cures into a solid. A very simple and easy-to-use container for making many types of molds is a paper cup. Remove the fiberglass mold. I'm sure there are many different ways to make this, this is just the way I do it. Use fiberglass to strengthen the mother mold section, allowing each portion to set completely before continuing. If you are making fiberglass for project, like a simple box, bowl, or other shape, you probably want to assemble a "mold" or "form" to make sure that your fiberglass, which starts off in liquid form, adheres to the right shape. The idea of a mold is to make a replica of the item that you need. Fiberglass is a great material to make objects with, but as fiberglass cloth is soft until painted with resin, it is difficult to use without a mold. –‘“âmøÓ´þËÈxQ5°„^”ËPºBy)‡žKÒ! Now I have pulled the top half of the stockinette back over the bottom half, so that I have a two layers. How to Make Molds: This Instructable is an introduction to the basics of mold making for people interested in mold making with little to no knowledge on the subject.It will walk you through some important vocabulary, break down the major mold types and help you select… – I don’t need these molds to last forever - in fact I’ll probably trash it after a few copies. I had some problems with my first mother mold (completely broke apart, crumbled). To make a latex mold, start by applying a layer of latex to your chosen object and letting it dry for 30 minutes. I think it helps the cut seam line up in the mold. Building a boat mold is one of the first steps in building a fiberglass boat. Here I have loosely tied a string around the top. Then start wetting out the carbon cloth with resin and laying it inside the fiberglass mold. The latter is of course the fastest method. In planning for the mold certain factors must be taken into consideration; surface finish, draft angles, undercuts, and method of production. In order to have a form from which to develop your mold, you must either build the article from scratch using wood, plaster, polyester putty, formica, sheet metal, etc. The top picture shows the blue silicone rubber mold after it has been removed from the popcorn cup. Due to the fact that I need the cast part to be as lightweight as possible (so that the gas mask will be comfortable to wear), I am going to make it hollow, and the most efficient way to do this is in a rotocasting machine (which holds the mold and rotates it in two different axis at the same time). Then you want to put your model on a piece of wood with at least 5 inches or so of room around the bottom of your model. This will allow you to take your time to produce the perfect mold before setting the fiberglass on it. Now repeat steps 8 through 14 above to build the second half against the first half of the finished mold. Coat the latex & kklay with Vaseline. I have a supply of … Cut off excess resin or fiberglass with a metal cutting blade. ?æ#ðƒ &áÐرS"w ^EÎH!_S ¶ÝˆC?¨‰¡IÇñÓ1!Å;Á^3(•ˆ. For fresh molds you must put several layers of wax on and I would consider PVA as well if the mold is less then a week old. You will be able to reuse the mold many times after. Check out this video tutorial on how to make a fiberglass mold layup for car speakers. I have a supply of picnic and popcorn cups in various sizes for just this purpose. Pry the fiberglass mold from the automotive part. The process is fairly simple provided you plan ahead and follow all … so that the gas mask will be comfortable to wear, which holds the mold and rotates it in two different axis at the same time. a fiberglass backup Mother Mould. 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