Hi, this is a mixture of a few instructables I've seen over the past few weeks, I wont go into it in great detail because there's loads of different instructables on polishing concrete, I'll do a few steps as 've taken some photo's anyway Click HERE to see more work
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Step 1: Step 1: Make the Mould
When making your mould just try to imagine what its going to weigh when its done because it was abit of a struggle to move around and its not that big. The steel is just part of an old fence that I used as reinforcing and doubled up as a handle too (I regret that bit and will probably cut it off)
When you're at this stage it's time to add any crushed glass or coins or fibre optics etc. I put crushed glass in with as many colours as i could find, I used spray adhesive to stick it to the mould, I also smashed all the glass myself but you can buy it off ebay if you want
The only other thing i will mention is that if you are putting glass in then you dont need to use melamine because spray adhesive makes it pointless, you can use any old bits of wood but not too rough grain or the concrete will stick
Step 2: Pour the Mix and Break the Mould
I did 3 seperate mixes with a slight colour change in the second whish shows in the brown band across the middle, then waited, I seperated my mould the next day but to be fair it wasn't quite ready so I left it for a couple of days to cure further, if you seperate it carefully enough then you could easily use the mould again.
Step 3: Now Polish
I bought a wet polisher for this part but now I've used 1 i can't see any other way of doing it, I forgot to take pics before I polished it so the ones you can see are just after when it's still wet, I also stuck a few coins and a bike chain in just to see how they polished
Step 4: Add Protection, Seal/wax
To protect the guitar from the concrete scratching it I used cow hide which I think is a perfect finishing touch, I plan on sticking a piece of carpet to the base to protect my wooden floor too, I've sealed it but I just havn't got round to shining it because i'm thinking about doing a clear resin finish instead of waxing, I'll update the instructable when I actually finish it