No, a 50 mesh count is probably too low for what you are doing. 50 would be used for screening glitter.
For textile application you will be somewhere in the range from 110-305.
Never heard of screens being stretched at different angles. As far as I know they are all the same.
For textile application you will be somewhere in the range from 110-305.
Never heard of screens being stretched at different angles. As far as I know they are all the same.