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Posted 9/15/2020 11:16:14 AM


Supreme Being

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Last Login: Today @ 12:29:48 PM
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Started repair work on the mold today. Fiberglass is pretty strong so I use a grinder to remove any major anomalies. The grinder with an 80 grit disk cuts through it like warm butter so must be careful. There is some waviness in some of the panels. Nature of using foam for a base mold I guess. I used an orbital sander with 40 grit paper for this. I will follow up with progressively softer paper and wind up with a polisher.

The biggest problem is the decorative lines. Some of them didn't come out well. I need a way to make them all equal. I tried making a sanding jig out of a block of wood but it didn't work to well. Might work better if I make it out of aluminum.

Any ideas?

Here's an example of a piece that has the grinder and 40 grit paper used on it.

Batmobile
Post #168771
Posted 9/15/2020 2:32:07 PM
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Last Login: Today @ 10:21:47 AM
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sly
"The biggest problem is the decorative lines. Some of them didn't come out well. I need a way to make them all equal. I tried making a sanding jig out of a block of wood but it didn't work to well. Might work better if I make it out of aluminum.
Any ideas?"

How about gluing, riveting, and/or screwing square plastic, rubber, or aluminum (square tubing or solid stock) to the inside of the mold.
This should allow you to mold in the decorative lines. My preference would be plastic or rubber.
You can buy square rubber or plastic molding for window glazing with an adhesive peel and stick backing.
If you need to curve the plastic/rubber moldings you can use an electric heat gun.
For aluminum, a propane/Mapp gas torch. vertigo
Post #168772
Posted 9/15/2020 4:15:51 PM


Supreme Being

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Last Login: Today @ 12:29:48 PM
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Good idea!! I'm going to look into it to see what I cam find. Thanks buddy.
Post #168774
Posted 9/15/2020 7:27:16 PM
Has NO LIFE!!

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Been thinking a little more on this problem.
You could also mill the panel divider lines, inside and outside from ridge plastic panels on your CNC machine and attach these to the molds.
Post #168775
Posted 9/16/2020 2:56:11 PM


Junior Member

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Last Login: Today @ 8:01:54 AM
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Looking good!!
Regarding the detail problem you're having with the lines....personally I wouldn't stress about it at this stage. Sure, sand the molds as smooth as you can, after all it's less work after you have the pulls...but that's just it. I'd be sure to build the areas that are missing some of the lines with a little more gel coat in my castings and then once out just router or tool them into the car part pulls themselves. That way you can also work in real perspective instead of inside out which you'll always have trouble with depth and perspective angles being the same from left to right.
Either way, however you handle it I'm sure you'll nail it bud.

David
Post #168777
Posted 9/17/2020 3:39:13 PM


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Thanks for all the advice on the lines. I'm working on it.

Finished all grinding today and went over everything with 40 grit paper. The best section is the large front half. That came out very well. I wonder if it was because I used body putty on most of that, although the main cabin part that I did totally with drywall mud came out not too bad as well. the bottom parts seem to need the most repair work.

Here's today's pic. Main cabin sections after first rough sanding.

Batmobile
Post #168778
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