I finally made the commitment to making a large batch of my standard white glaze in order to move beyond the size limitations of a 5 gallon bucket and the nuisance/mess of transferring glaze from said 5 gallon bucket to shallow bins for plates. I was hoping to find a 15 gallon bucket with an available bucket dolly, but no such bucket appears to be on the market. I ended up going with a standard 20 gallon Brute garbage barrel.
I mixed up three 10kg batches of my glaze, which amounts to about 12 liquid gallons. It fills to just above the halfway line of the barrel (the barrel tapers out toward the top). In addition to sitting low in the bucket, there is an annoying trough around the perimeter of the barrel's floor where the barrel dolly locks into place from the underside. I anticipate this trough will make stirring up the glaze adequately a challenge. So I'd like to make the 20 gallon barrel act more like a 15 gallon barrel with a flat bottom.
My idea is to pour concrete into the bottom of the barrel to fill the trough and raise the floor of the barrel up by a few inches. I've never worked with concrete before, so in doing some research I learned that it is porous. So my question is: Will the porosity of the concrete matter? Will the concrete absorb one or more of the glaze ingredients in higher concentration than others... will the presence of the concrete throw off the chemistry by trapping one ingredient disproportionately? Will the concrete break down over time?
If it is not safe to have the glaze in direct contact with the concrete, my plan B is to cut sheet PVC to the exact shape and size of the concrete slab and seal it in the barrel on top of the concrete.
Thoughts, recommendations, warnings and alternative ideas will be appreciated.
PS I know the easiest answer is to make up another 10kg batch or two of the glaze, but it's and expensive recipe and I'm out of materials.