I have found this method to help alot with end grain tearout near the end of the bowl turning process. Turn your bowl close to the finished size using very sharp tools then give the bowl a very light coat of shellac ( I use Zinsser Bullseye shellac in a rattle can from Lowes ). Sharpen your tools again and then use a sheer cuts to finish the bowl.
Bulls Eye ShellacThings I have found that helps with end grain tear out is very