2nd Bat
Master sergeant
Posts: 11,813
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Post by 2nd Bat on Mar 11, 2015 22:46:57 GMT -5
I am working on a number of projects and one of them called for creating a sizeable front hanguard using dyna glass. Typically it takes several layers and lots of sanding. I decided to create a mold of sorts with cardboard walls to keep the paste in shape and hopefully create a series of even, straight sides, minimizing my sanding. I rubbed the cardboard in wax so it would pull off nicely once the resin hardened.
I applied the dyna glass late last night and the shape on the gun looked perfect. I had the cardboard gusseted nicely and was looking forward to the results. This morning, inspite of the wax, the cardboard bonded with the resin paste and I literally spent a messy, nasty day seperating the cardboard with a series of peels and cutting. The resin swole up a bit as well but instead of spilling up and out of my cardboard "mold"" instead it pushed against the cardboard and dried in a cordouroy patter, kind of cool actually but not the effect I was looking for! What I was hoping would save me a ton of time DIDN't. Imagine spending a day peeling sticky labels off your project and still having to sand and reapply at least one more layer.
I now have two more days on a project I hoped would be done.
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Post by volkssturm on Mar 12, 2015 10:10:03 GMT -5
Yep. Resins can be a real pain in the rear. They seem to go where you don't want them and stick on things they shouldn't.
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2nd Bat
Master sergeant
Posts: 11,813
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Post by 2nd Bat on Mar 12, 2015 21:06:25 GMT -5
After a full day at it I got things to the point I was hoping things were going to be two days ago. Perhaps sheets of thin ABS coated in wax would work? Not going to try it on anything big!
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Post by insterburger on Mar 13, 2015 5:42:36 GMT -5
"Negative results are just what I want. They’re just as valuable to me as positive results. I can never find the thing that does the job best until I find the ones that don’t."
--Thomas Edison
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2nd Bat
Master sergeant
Posts: 11,813
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Post by 2nd Bat on Mar 13, 2015 13:03:32 GMT -5
Old Tommie said perseverence was his greatest strength. For every lightbulb success he had 99 dead ends. It is true that we learn from our success but I much prefer learning from my successes! incidently this particular project (not WW2) is coming out quite nicely and has taught me several things I can use moving forward on other endeavors. I laminated a stock for it gluing five layers of similarly shaped cut outs. Once glued it was relatively easy to shape and sand and the finished product stained nicely. Taking what I learned has opened up additional possibilities.
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2nd Bat
Master sergeant
Posts: 11,813
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Post by 2nd Bat on Mar 16, 2015 20:58:19 GMT -5
So I went by TAP plastics where I buy products and get lots of creative ideas. I mentioned my experience with the Dynaglass and cardboard "mold" and the tech there said simply have a layer of wax paper between your cardboard walls and your resin. According to him it comes right off and leaves a surface so smooth it requires little sanding. Next time I'll give that a go!
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2nd Bat
Master sergeant
Posts: 11,813
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Post by 2nd Bat on Mar 17, 2015 14:12:58 GMT -5
I experimented with the concept on a part I may use later. I cut out carboard in a size and shape I wanted building in additional size to add tape. I cover the carboard in cut out wax paper and taped it into place. (tricky as tape doesn't want to stick to the wax paper either). I spread in mixed resin paste (which has the properties of thin peanut butter). Resin paste hardens at a pace that coorelates to how much hardner you mix in and outside temperature. it requires very little cream hardner to work, just be sure you blend it thoroughly till your color is even. Once ready I slopped it into my wax paper lined cardboard shape and gave it several hours. I then cut and peeled off my outer cardboard wall and sure enough, it came right off and my resin was smooth and required very little finish work. there were a few small areas where I hadn't sufficiently tamped down the material which left a few small gaps against the mold walls. (easy fixes)
The wax paper is definitely the way to go.
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