I've completed what I think is a half-decent concrete fireplace hearth using a wooden mold. While I did vibrate the mold considerably, the end-product has a number of holes in it that need to be filled. I am having significant problems finding the right slurry mix ration to accomplish this. Although most DIY posts on this and similar projects, like countertops, involve great detail for each step, most end with a rather ambiguous "then mix a slurry to fill pinholes" with no detail on the mix. I drilled down further, searching the internet and youtube videos for slurry mixes. Many require 3+ products to create the slurry that are not available at home depot and ultimately never provide exact details for mix ratios. Those sights that do include a mix ration often provide the following: 2 parts portland cement, 1 part water, optional bonding agent. Many of these sites ultimately instruct to go easy on the water, mixing only until you get a "peanut butter" like consistency.
I tried utilizing the portland cement, water, bonding slurry today. Despite mixing it to a peanut butter consistency, the mix was far too dry and began to harden almost immediately when I applied it to the hearth. I quickly added more water to thin the mix to a more yogurt-like consistency, that didn't help things either and the slurry again began to dry within 2-3 minutes of applying. I ended up scraping everything off at this point and am now turning to you wise folks for help:
1) Does anyone have a good portland cement to water mix ratio they recommend?
2) If portland cement/water is not a good slurry, what do you recommend for a specific slurry recipe (ideally using products available at home depot).
3) I have this wild idea to take self-leveling underlayment mix I already own, mixing it into a paste with less water than the bag calls for, then spreading this on my hearth as a slurry - would this work?
Thank you all in advance for any advice you can provide here.
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