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Post by downunderdave on Apr 28, 2024 19:31:38 GMT
Hi Dave, cheers for the info in this post and the last, Can I ask how long you left the concrete before sanding and polishing it? I think it looks like a very boring task and I think I would rather leave it for a bit and maybe do it in-between brick work or if the weather is a bit wet. I looked up a Hilti grinder and they look quite robust but look more like grinders, Would you be able to describe what process you went through for polishing the worktop? Cheers Gary When you build the formwork you will need to also place some temporary timber props in addition to the block piers. Make sure to cover the layed up concrete with plastic once it has set. Keep it covered for at least a week to enhance its strength. These pics may help. The initial set is very temperature dependant, so a week of setting is advisable to avoid your machine pulling out some aggregate from the surface., the initial coarse cut wil reveal the aggregate slightly and more and more on subsequent cuts, so it more exciting than boring. After making about 3 decent passes I had to return the larger hired machine. You then need wash down the sur face to inspect it. I then proceeded with my smaller 100mm wet polisher with a 100 grade pad fitted. A couple of passes with this and then fill all the tiny pin holes that will be revealed. Leave Thes for at least 24 hrs before polishing again. Then proceed to polish again with finer and finer grade discs until you have the surface you want. I went down to 400. Filling pin holes about 3 times. It’s actually pretty good fun. I suggest you skip doing the area that your oven will cover. You also need to seal the surface after polishing. Use a thinners based sealer.
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