{"product_id":"fiberglass-mold-making-kit-pro","title":"Fiberglass Mold Making Kit - Pro, Gallon Tooling Gelcoat + Gallon Isophthalic Resin","description":"\u003cp\u003eA full gallon of tooling gelcoat and the release, glass and tools to back it. This is the rung for a mold you intend to run production parts off, where the face has to stay flat and the laminate has to be thick enough not to move.\u003c\/p\u003e\u003ch3\u003eWhat is in the kit\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e1 gallon tooling gelcoat with hardener, no wax, black or orange\u003c\/li\u003e\n\u003cli\u003e1 gallon isophthalic polyester tooling resin with 8 oz MEKP\u003c\/li\u003e\n\u003cli\u003eTwo 12 oz tubs of Partall #2 paste wax and two 32 oz Partall #10 PVA\u003c\/li\u003e\n\u003cli\u003e1 yd 0.75 oz veil mat, 3 yd 1.5 oz chopped strand mat and 2 yd 24 oz woven roving, 50\" wide\u003c\/li\u003e\n\u003cli\u003e1 quart fumed silica and 1 lb of 1\/4\" chopped strand for filleting corners\u003c\/li\u003e\n\u003cli\u003eTwo wet\/dry sandpaper prep packs for finishing the plug\u003c\/li\u003e\n\u003cli\u003e3\/8\" x 5\" fiberglass roller and a 1\/4\" corner roller\u003c\/li\u003e\n\u003cli\u003eEight 2\" chip brushes, 8 graduated cups, stir sticks, gloves\u003c\/li\u003e\n\u003cli\u003eA full pint of surfacing wax, four release wedges, instruction card\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eWhy double release:\u003c\/strong\u003e on a mold this size you are waxing a large plug several times over, and you want enough PVA left to redo a panel if a film goes patchy. Running out of wax halfway through waxing a plug is how first pulls get ruined.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eLaminate in sessions.\u003c\/strong\u003e Do not try to put 8 yards of mat down in one go. Heavy polyester laminates exotherm, and a thick wet stack on a hot day will distort the face you just gelcoated. Two or three layers, let it firm up, carry on. Only the final session gets surfacing wax.\u003c\/p\u003e\u003ch3\u003eThe three waxes, because everyone mixes them up\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePartall #2 paste wax\u003c\/strong\u003e is the release barrier. It goes on the plug, 3 to 5 coats, buffed between each.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePartall #10 PVA\u003c\/strong\u003e is not a wax. It is a water-soluble green film brushed or sprayed over the wax as insurance on new plugs and first pulls. It washes off with warm water.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSurfacing wax\u003c\/strong\u003e is an additive you stir into the \u003cem\u003elast\u003c\/em\u003e layer of resin only. Polyester cures tack-free only when air is sealed off it, and that is what the wax floating to the surface does. Put it in an intermediate layer and the next layer will not bond.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eWhy the gelcoat says No Wax:\u003c\/strong\u003e a mold face gets laminated over. Wax at that interface is exactly what you do not want. That is the difference between tooling gelcoat and the waxed gelcoat you would use as a finish coat.\u003c\/p\u003e\u003ch3\u003eWhy chopped strand mat and not 1708\u003c\/h3\u003e\u003cp\u003eThis is the most common question in mold building and the answer is not the one people expect.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eChopped strand mat is random-oriented\u003c\/strong\u003e, so it has no grain and prints no pattern through to the mold face. A tool copies itself into every part you ever pull off it, so fibre read on a mold is permanent in a way it never is on a part.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMat conforms.\u003c\/strong\u003e It goes into compound curves and tight radii without bridging. 1708 is a stitched structural biaxial: stiff, prone to bridging in a corner, and its stitch bundles telegraph as the laminate shrinks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1708 is a structural fabric\u003c\/strong\u003e, built for directional strength in a part. A mold does not want directional stiffness, it wants dimensional stability and thickness. 1708 also costs nearly twice as much per yard for a job mat does better.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eUse 1708 to repair a transom or lay up a hull. Use mat to build the tool that makes them.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere woven roving comes in:\u003c\/strong\u003e once a mold passes a few square feet, all-mat laminates get floppy, and a mold that flexes makes parts that do not fit. Roving builds thickness and stiffness fast. It never goes against the skin coat, always with mat between it and the face, because the coarse weave will print through otherwise. The schedule in this kit is veil, mat, mat, roving, mat.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFillet your internal corners before you laminate.\u003c\/strong\u003e A sharp inside corner is exactly where glass bridges and traps air, and a void behind the gelcoat becomes a chip on the first pull. Thicken a little resin with the fumed silica into a peanut-butter putty, run a radius into every internal corner, and let the glass follow a curve instead of a crease.\u003c\/p\u003e","brand":"Boat Suppliers","offers":[{"title":"Black Tooling Gelcoat","offer_id":52485088674094,"sku":"SK-MMF003-BK","price":419.95,"currency_code":"USD","in_stock":true},{"title":"Orange Tooling Gelcoat","offer_id":52485088706862,"sku":"SK-MMF003-OR","price":419.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0840\/4071\/2494\/files\/Boat_Suppliers_Black_Tooling_Gelcoat_with_Hardener_-_1_Quart_Kit_c3727844-3ebd-4e89-b16b-78a6af17d152.jpg?v=1787279241","url":"https:\/\/boatsuppliers.com\/products\/fiberglass-mold-making-kit-pro","provider":"Boat Suppliers","version":"1.0","type":"link"}