We have been milling the burl slabs at 3" thick, We have figured out that if we use the pressure washer (2500 psi) too clean the slabs of clay, dirt and spend some time removing all of bark off the 3" live edge too expose the beauty of spikes and karbunkles it should really help with the air drying process. When they air dry down too 16-18% they will be ready for kiln drying.
When there dry and ready for wood working we will take them down the road close by too my friend that has a awesome CNC machine that can flatten, sand and polish the surfaces.
Then we will pour dentures alcohol on surface and take pics for internet marketing.
The Pentacryl is new too me and we are trying different techniques so far brushing it on heavy seems too work.
We wait two weeks after milling so all the pressure washing water has a chance too dissipate.
We're only using Pentacryl on end grain slabs.
Results have shown no major checking or curling on the thin practice cookies we have for testing using cedar, fir, oak, Madrone.