If ypu are concerned about SewAll not being strong enough you could use Jeans or TopStitch, but it might mean altering the bottom tension which is not recommended unless you really know what you are doing! If your machine has a separate bobbin case you could try keeping one for regular threads and don't mess wth it, and one which you play around with for thicker threads. If your machine has a drop-in bobbin you don't have that option.