I once found some cheap masking tape at a discount outlet, (less than half price!) and bought a bunch of rolls. It worked OK for masking while epoxying or varnishing. I stored the leftover rolls in my toolbox for the next build. A couple of years later I tried to use the "cheap" tape and it wouldn't even tear off the roll without ripping, the adhesive was partially dried and wouldn't stick properly. Long story short, I trashed the rest of my "bargain" purchase. Now I buy the good stuff just before I need it.
Bob