As I indicated in my original reply to this topic -- I have steamed the *!#@@$ out of the fused blocks and SAS remains gummy -- almost like rubber cement. I have completely saturated the piece with water (even soaking over night) and ironed with steam for minutes, literally, by the clock. Nothing works. I have contacted the company and they have been very nice, but continue to insist that I just have to fuse longer. I don't think so. It is not physically possible to fuse longer. I think this was a defective batch. Unfortunately, I am just going to have to live with it because the blocks were made by work colleagues, each is unique for that person and they cannot be re-done. If it was just me, I would start over.
I have been using alcohol to clean off the needle. I will try a titanium one, and the sewer's aid trick. thanks.