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Post by Fox on May 6, 2015 22:26:22 GMT -5
Seems to me that you could make a mold quite easy by mixing a thin batch plaster of paris in a tub a few inches deep, bounce it on the ground gently for a bit to remove air bubbles and level it and then push the panel you have into it to make a negative. Maybe coat the panel with cooking spray so it doesn't stick after the plaster sets up.
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Post by humanshield on May 6, 2015 22:58:18 GMT -5
Have you ever used plaster of paris to make a mold?
Fox is basically correct.
But since you have the opposite piece is good and you need to repair the other piece, you need to make a reverse of the good side in order to lay the bad side in it and use fiberglass to fill in the blanks. To do that you will need to make a cast of the good piece, making sure the bad side areas that you will be repairing will lay completely in the mold when you're done.
So step one is make a mold of the outside of the good piece in such a way that when you're done the broken piece is going to fit and lay in the mold and perfectly guide the fiberglass you lay to repair the broken piece.
Let that harden overnight. But you can separate it sooner.
Next, you'll lay saran wrap over the first mold and then create a negative that will fit inside the opposite piece.
Finally, you'll lay the cast negative inside the broken and fiberglass in layers to the edges.
You dont really have to worry about the fiberglass sticking to the plaster of Paris. It doesn't stick very well and releases easily.
But if you're worried, spray it with Pam first.
If you do this correctly, you will have a very close to original fiberglass repaired piece that you will then cut (I use a dremel tool then coarse sandpaper) to shape it.
The last step is to fill and sand with bondo then paint.
Think this through before you start so it makes perfect sense and it will go easier.
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Post by derbiman on May 7, 2015 9:40:38 GMT -5
Thanks for all of the replies. I will try it and see how it goes.
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Post by Fox on May 7, 2015 18:20:56 GMT -5
The more I think about it the more I feel that cooking spray may react with the water in the plaster and cause surface bubbles so you'll end up with little pits in the mold. Maybe some wax would be a better option?
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Post by derbiman on May 7, 2015 19:44:30 GMT -5
Good idea.
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Post by humanshield on May 7, 2015 19:51:11 GMT -5
The POP is gonna get hot as it cures. Surprisingly warm. For about 10 minutes.
I haven't had any problems getting it to release plastic parts. But I separate them before it fully cures. about 20 minutes after I mix it
and cast the mold I want
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Post by derbiman on May 8, 2015 7:34:41 GMT -5
I have made things out of plaster of paris before but only in silicone rubber molds. I will separate the plastic from the mold after it gets hard enough to be removed. Thanks for all of the info.
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Post by humanshield on May 8, 2015 13:15:15 GMT -5
You should have no trouble in that case
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Post by highmoose on May 10, 2015 23:59:44 GMT -5
wow good idea will use it if i ever need.
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Post by derbiman on May 11, 2015 9:38:42 GMT -5
Parts for these Spanish scooters are hard to find. They are pretty rare here in the states. You can find them in Europe,but they are getting scarce.Germany is a good source,but the shipping is very outrageous(that is if they are even willing to ship to the US). This seems like a reasonable alternative to the expensive foreign parts.
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xyzm
Scoot Member
Posts: 26 
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Post by xyzm on Jun 5, 2015 22:10:32 GMT -5
a 3D printer is another solution!
I got one about 5 weeks ago, and its finally up and ready to do some work.
Max print area 7 by 7 by 7
Prints in ABS
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Post by derbiman on Jun 10, 2015 21:19:40 GMT -5
Wow, now that is state of the art!!! I bet that thing costs a pretty penny. Cool!!!
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