I picked up a 1000 lbs of aggregates and sand and rinsed about 300lbs of the larger sizes. I was able source everything local to avoid shipping costs but the "flour" portion made up of powdered quartz and alumina- I got that online from the big ceramic store 50lbs for 50 bucks including shipping. FYI, it really does feel and look like fine flour. Everything else came from Home Depot and the local West LA Building Supply store.
On top of that, the epoxy came:
Attachment 272632
Supplies:
Decomposed granite, 60 grit sand, small pebbles and a giant 90 gallon mixing tray:
Attachment 272630
Unloaded:
Each sand bag is 100 lbs and the rest are 50 or 75lbs + more in the garage
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I am easily amused but the mixing tub really is awesome- you can mix the whole batch in one shot.
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Here are the different aggregates:
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To promote adhesion, you need to wash them and let them dry properly. The decomposed granite was really dirty:
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30 and 60 grit sand also- I didn't have to wash that because you can buy graded washed and kiln dried fairly cheap in 100 lb bags.
Here is a close of the mineral "flour"
Attachment 272642
Well, my arms are sore but I hope to be able to pour the mold this weekend if I can get the rest of the aggregate washed and dried...