Quote Originally Posted by Phrank View Post
If the razor is not laying flat on the steel plate, in a case of an old vintage razor for instance, would the building of slurry aid or assist in correcting the geometry of the razor?
A razor only lays flat if it is absolutely straight. 99% of what I make is smiling. With smiling razors, the one and only important fact is that when you roll the razor from heel to toe, the contact points of the edge and the spine should both roll together. The steel plate isn't for honing, in case I wasn't clear. It is just a known flat object for showing me how the razor will make contact during honing.

Based on how I see the razor behaving, I adjust the grind to gradually align the edge and the spine as the edge get thinner, so that the razor will hone correctly with a rolling X.

If you mean old vintage Solingen ('straight' razors), the yes, slurry would assist because it would set the bevel more aggressively, though it would of course be a bit un-even. vintage Sheffield is usually smiling, and as such would never be flat on the hone to begin with.