".. then I sand it and and it turns to a piece of junk. I have tried every thing but I may get out the tool mark maybe not but I end up with more marks when Iam done than when I started makes me want to quit."
- Karda
Hmmm, this is a bit confusing without more information, such as what wood do you generally use, what type and brand of lathe chisels, what type, brand, and in what order do you … sand.. haha. Maybe I'll just tell you what I figured out instead.
First things first. If you are turning dry blanks, anytime you cut across endgrain you are very likely to get that ugly tear out that is so time consuming to sand smooth. This can be the wood, your technique, your tools not being sharp.. whatever it is, my solution is the same. I stop short of my final profile by somewhere near 3/8" if I'm having and grain tear out issues. Then starting with 60 grit sandpaper and the lathe running, I will use my 6" Bosch, my 5" makita random orbital, my belt sander, sometimes even my angle grinder with a chainsaw tooth blade (I highly recommend NOT doing this, its absurdly dangerous).. and force my will into the bowl with sweat and dust and occasionally blood.
Only go up to 100-120 using larger power tools, but use each and every grit on the way up, and that goes for ANY sanding you want to look good. Especially bowls. (See my profile photo for evidence of what not skipping grits can do. That was 80-10000 grit, I'm sure I didn't have every grit once I got above 400, but I had enough.)
Anyway, now that the bowl is profiles with power Sanders you need to switch to either hand sanding, starting over at 80 grit, or, if you have to money I highly recommend checking out Vinces Woodńwonders and/or the other one with a very similar name. And get a 90° or angled drill outfitted with 2" and 3" sanding pads. ... it takes a bit of practice, but once you get it down, and remember you can't rush or take shortcuts.. you'll start getting results that remind you why you bought the lathe in the first place.
"Nothing in the world is worth having or worth doing unless it means effort, pain, difficulty… I have never in my life envied a human being who led an easy life. I have envied a great many people who led difficult lives and led them well."
^^^ don't listen to Theodore Rosevelt, he had some sort of personality disorder. Listen to your inner procurement specialist and get more power tools, I swear it might help. 100% maybe for sure.