New answers tagged technique
It's all in the aggregate. There are a lot of options depending on the look you're going for. Abalone shell is popular, and monochromatic glass chips could work well too. What you do is add a lot of these aggregates to your concrete mix (appropriately colored, and including performance-enhancing additives such as metakaolin or ground granulated blast furnace ...
It's called terazzo: The basic process is: add your 'sparkle' substance as aggregate (glass is a typical option) pour concrete after concrete sets, you use a diamond grinder to expose the top layer of aggregate
You can add white rock on the surface of your cement & tamp it in then finish this will give some color. Exposed aggregate uses this technique if they want white, black brown rock not just plain cement. Bags of colored rock can be found at many home improvement stores.
Use an awl and punch it to center mark your location (so the drill bit doesn't walk). Drill a small pilot hole (to insure correct placement of the hole). Enlarge the hole to the tap's specification. Countersink (without the hole as a guide you run the risk of the countersink going off center). Tap (run it through again if you had to readjust the countersink ...
You countersink first, then drill, then tap. If you countersink after drilling the hole, the finish on the countersink dome will not be as good. I would recommend drawing a circle indicating how wide the countersink diameter should be so when you make it you know when to stop.
I would countersink and then tap for two reasons. The first is the countersink bit could damage the first thread and make installing the bolt a problem. The second is there is less metal to tap and therefore easier and less wear on the tap. Happy Day!
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