Searching for sewing supplies at our "local" WalMart I only found two options for 100% polyester thread. Both Coat's brand. One was labeled for outdoor apparel. UV stable etc. +$4 for I think a 200yd spool. The other was for overlock machines. 3000yd for $1.94. I'm in the learning to sew phase. So I purchased the overlock spool of thread. Is this thread junk? Should I replace it with a thread of known high quality like the spools available from Speers for any DIY projects?