Isaac ... I have been 'using' System Three Mirror Coat on a burl I am turning and am having a blast. I believe the burl slab you have is beautiful and the System Three Mirror Coat would look great on it.
Three ounces of the mixture will cover and protect one square foot ... then one waits 4-8 hours, and if all is cured just add another coat to increase the depth. The mixture is excellent in covering any flat inlay work if you do that sort of thing.
The mixture runs like water, so going over any edges might be a problem. I just run a strip of tape all around the perimeter of the top and make sue ever little crevice is sealed. Then you can set the table level all around and start pouring. Sand bags are great for this step and the also will hold the table quite steady in case some interested person should bump into to while the mixture is curing.
The finished top is amazing and the wood grain is very well displayed.
Check the website
www.systemthree.com for more information. Woodcraft is an authorized vendor and often stocks the product.
Please post your finished photographs so we all can see what is discovered. Great luck on your project!