the big trick is how WET is the cement slurry? it will pour off the sides, taking water and cement.. the best thing to test is an old window screen to pour slurry onto first..let drain, THEN pour the mushy mix..of course the Portland cement mix will begin to set if you wait too long. how will you determine the evenness? does it matter?
layering old sheets, burlap, onion sacking, etc. with a cement slurry to cure in layers, etc, many ways to make test panels.
how the paercrete sticks to FLAT ply is another issue..just try it, keep good 'science' notes as you go.
also consider a hydrated lime+paper mix..that can sit days as it loses water, and can be trolled into place or drained over the tub mixer, then dump onto the board. stapling netting or rough it up in some way will make it stick better.
I have used a paper-clay-lime-sawdust- asphalt emulsion mix onto old punk boards, and it sticks well.
see pics of a CARPET coated with a "rubberized" crete, and the old board:
Charmaine
"Pleasure is a shadow, wealth is vanity, and power a pageant; but knowledge is ecstatic in enjoyment, perennial in frame, unlimited in space and indefinite in duration."
―Dewitt Clinton"Discoveries are often made by not following instructions, by going off the main road, by trying the untried." — Frank Tyger
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