Fibreglass Moulding... How To?

Question:
I am looking to make a fibreglass bumper for a race car application. I currently have a bumper which can be used as a negative but needs to be modified slightly. Can someone help me out and give some advice as to how to create a negative mold and then create the bumper I require?

Answers:

Of all the schooners ever built before 1940 which one would be called "The worlds fastest"?

First, prep and seal the plug (your existing bumper). Then coat the plug with several coats of mould release agent. After that has cured spray a thick coat of gel-coat on the part. After the gel-coat has cured, usually two to four hours, apply a layer of 1 oz chopped strand mat using polyester tooling resin. Smooth out all the air bubbles and let the first layer cure. Then apply 3-5 layers of 1.5 oz. mat, letting each layer cure before applying the next. Allow several days for the entire mould to cure. Remove any excess mat and or resin that has spilled over the edge of the mould and you should be able to pop the plug free, a little persuasion with a plastic or wooden wedge may be required. You now need to sand the mould to 600 grit, polish and seal it with wax. You then basically reverse the process to make the part, i.e., mould release, gel-coat, mat, etc. It's very time consuming and labor intensive process, so if there's a commercially available bumper, you would be time and money ahead to just buy an aftermarket piece. Good luck!

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How do you put a big sailboat in and out of the water. Like maybe a sixty foot yacht. I saw some?

Make a mould from your existing bumper, then cast a plaster/rubber/plastic copy. Modify the "soft" copy as required, then make another mould from it.
Then use *that* mould to make a plug.
Lay up your glass on the inside of the mold, and use the plug to compress it to shape

Is the mast of a sail boat commensurate with the length of the boat?

Oh, and ... polish, polish, polish!

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