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Mold Flange Adhesive

Old 08-26-2007, 02:51 PM
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Default Mold Flange Adhesive

Hello,
What is the recomended Adhesive for attaching the mold flange to the plug? Any help would be appreciated.

Thanks in advance,

Ron
Old 08-26-2007, 04:39 PM
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Default RE: Mold Flange Adhesive

Bondo works great applied to back side of flange . Be sure to spray on PVA first . Will pop off when ready to remove with no problems .
Old 08-26-2007, 09:06 PM
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Default RE: Mold Flange Adhesive

Thanks for the info. will give it a try.

Ron
Old 08-27-2007, 12:48 AM
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Default RE: Mold Flange Adhesive

Moldmaker is right. The best flange edges I've ever gotten was using bondo. Leave a little sticking up above the flange, pop the plug out, sand it flush with the flange, re-install the plug and lay up the mold.

DLD
Old 08-27-2007, 12:53 AM
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Default RE: Mold Flange Adhesive

I like resin and cabosil myself, takes longer to set up, but good and strong, easy to shape. Downside is that it's more expensive
Old 08-27-2007, 11:17 AM
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Default RE: Mold Flange Adhesive

In the past, I've cut the flange to fit closely to the plug and filled the gap with modeling clay. I used a razor blade to square up the edge to the plug. It's worked well but it's time consuming and fragile. I may try the bondo next time.
Old 08-27-2007, 01:08 PM
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Default RE: Mold Flange Adhesive

Jake,

I used to use clay and a razor blade myself. Try the bondo method on your next mold. The first time I tried it I was amazed at how much better the joint between the two halves was.

DLD
Old 08-27-2007, 02:19 PM
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Default RE: Mold Flange Adhesive

I have heard bondo works well but have not tried it. I use modeling clay, and build a box to set the parting board onto. I use wood blocks with clay ''pillows'' on the bottom of the box to support the plug from underneath so that it does not shift in the clay parting line. I plan to try bondo on my next mold, but will still support the under side of the plug. I like to get the parting line dead nuts down the middle.
Old 08-28-2007, 12:55 PM
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Default RE: Mold Flange Adhesive

My previous parting board setup. A piece of 3/16" lexan cut to the profile of the part and then filled with modeling clay. Will cut fence a little larger around the plug next time and use bondo (by the way - use the premium Bondo now available - it doesn't develop the sand-paper-eating tacky exterior that the standard stuff does).

Old 08-29-2007, 04:47 PM
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Default RE: Mold Flange Adhesive

Evercoat is the best sanding 'bondo' filler I've used. It cures quick and sands like 'budda' with no gumming of the paper. Found at auto stores or auto paint shops.
Old 08-29-2007, 10:53 PM
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Default RE: Mold Flange Adhesive

I use parfin wax. I start out by tapeing the plug in place on the top of the parting plate. Then I pour wax, just warm to flow. Then let cool 1 hr, then turn over and pull tape off. Then take a small square to scarp off the exsess wax.
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