Edit: You seem to know a lot (Do you work with it?), so I'm asking something: what starting point should I have for my pigment tests with iron oxide? If I want to match my tile below, I understand if you can't say exactly but a starting point. I read somewhere that 0.8% pigment gives dark gray, so I'm thinking of going with 0.4% and then +/- 0.2%, so it will be 3 loads with pigment test
I am a happy amateur who thinks concrete is a fun material....
I can't speak for Weber's recommendations but when I cast a slab or similar, I use 931, which is a pumpable concrete, and I think you'll get an okay surface if you use 931 for countertops, but I think EXM702 is better.
And yes, EXM separates over time regardless of storage, I noticed last time when I took an old bag, was too cheap to throw it away....
I have no knowledge of pigmentation, yet. I'm experimenting a bit myself with different pigmentations for my pool stones....
Don't forget the release oil or release powder; I prefer the oil as it also provides a certain impregnation to the mold if there are small scratches that might otherwise swell or otherwise ruin what you're casting.
I often use laminated MDF, but these molds are usually more of the disposable type.....
Any oil except brake oil and hydraulic oil works fine, but if you're going to use the mold again and maybe not the same day but a few months later, I wouldn't use cooking oil, it can turn rancid and smell less pleasant. I also think mold release oil is safe if you're going to pigment treat the surface afterward, but I'm not sure. However, I know that formply releases like that after a few uses and the plastic film on IKEA's doors releases after some casting if you don't use oil
A few years ago, I cast something with expanding concrete and had some left over, which I poured into a hole in one of the slabs on the garage driveway (old slabs that were worn and crumbled). I just poured it into the hole and left it. The surface (on top) became almost mirror smooth. So if I want to cast something with a nice finish, it should be expanding concrete
My dear partner has taken on the responsibility for the bänkskor as she wants to feel more involved in the renovation, which I welcome with open arms. Pigment test started
The above images are 702 so we will see how it turns out. The pigment took more than I thought, barely the one with the least pigment is light enough. But I'll let it burn for another day and see, as it might lighten further due to the evaporating water.
Two things I don't understand:
1. How you can manage to be so incredibly meticulous with all the details that no one will ever notice. I've never experienced anything like it in renovation contexts. How long have you been working on that little bathroom now? Six months?
2. Why you mix pigment in the concrete if you want it to be the same shade as the floor? The floor is light. The concrete is already the same or darker - unpigmented.
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