I use Maxi Lock for embroidery.

I have used Maxi-Lock a lot for FSL and it works great. Use the same in the bobbin for FSL. Try it, I think you'll be happy with the results. Hugs..Carol

I use serger thread for fsl, too, sometimes. I don't know Maxi-Lock, but I got some cheap one from JoAnn Fabric, and it works better than the embroidery thread, in that it doesn't break on heavy laces most of the time. It does have a LOT of lint, though, really have to watch that if you get cheaper thread. I think it works up very pretty. Hugs, Marji

I did much FSL last year for Christmas, and found out when I ran out of white emb thread, that Overlok/serger thread makes the project a softer white. They were actually very pretty. BUT, clean the fuzz from your machine often. Hahaha! Hugs, Judy

My serger thread is a large cone of polyester thread and I use the cream for the bobbin thread for most of my embroidery. It does not fluff any more that other polyester sewing thread. I will only use the matching emb thread for work that will show both sides.
For FSL I use "Serelon" polyester sewing thread,for bobbin and top. This thread is stronger and it comes in a wide range of colours and is the best for dressmaking, also for patchwork and quilts, no tension problems and your seams will last for many years in the wash. Other polyester no name or cheaper brands deteriate in the wash.
happy stitching!

Most Surger thread is polyester and is usually 60 weight.

I googled serelon thread and found this link.
It is available at most fabric shops here in South Africa.