Slash McCoy
I freehand dog rockets
No. It bends freely but will not stretch. So you can lay it on a plate that is convexed in only one dimension but not two. You can convex side-side, or end-end, but not both. Me, I wouldn't bother and I certainly can't recommend it to a beginner but it could be an interesting experiment. Noobs shouldn't experiment. They should get right on with it and make some professional grade or better edges before going off on tangents, and this is most easily done by doing exactly what others who get great results, do.It would be really interesting to see what you can do with this. The only problem is see is to get the film to fit over a curved surface. Is there any elasticity in these lapping films?
Too much convex could make the edge of the film come up off the plate and let air under it. So the convexing should be very subtle, particularly at the ends of the plate.