Hey, i'm going to assemble a large part from several smaller Sandstone parts., I want the seams to be invisible. I was thinking of emulating the printed matter by mixing some glue and sandstone dust and applying that to the seams.. Anyone have pointers or tips based on personal experience?
I think you will be better off leaving the seams plain. As long as the edges are flush and not chipped, it should be fairly discrete. The reason a post-application won't work is that the seam will become saturated, so it will become glossy. It will also protrude, and if you try to sand it, it will turn a dusty white. Put a gel-type super glue on the inside of the seams, far back enough that it will not squeeze out, then gently clamp the two halves (with a rubber band, for example) and place the model, seam downward, on a flat surface so the edges will be flush.