What is the thread recommended by Coats for stitching of vulcanised / autoclave upper shoes? What SPI should we use to stitch adult upper?
Can I add lubricant / silicone to the thread?
Coats does not recommend adding any additional lubricant / silicone on thread. Thread colour may change, it can create large variation of frictions and cause oil staining. Atomised silicone may also become a health issue if breathed by operators / machinists.