... And Then We Set It On Fire" blog that the fiber reactive dyes can be set immediately after printing with a spray of soda ash and water solution on the back before leaving in a warm place to "batch". It worked like a charm.
And I love that my electric mattress pad will batch a whole batch of fabric at once. I just make sure my fabrics are securely wrapped in plastic trash bags. Then I put them to bed between (or under) the sheets, turn the control to High, and go about my business. If they haven't been there long enough at bedtime, I make sure I put the bags of fabric under the mattress pad, turn the heat down (or even off), and use my body heat to continue the process. The outside temperatures hovered right around zero all week, so it worked put perfectly! An electric blanket will be equally effective. A bonus of living in a cold climate.
If you are a fiber artist, you really need to check out "... And Then We Set It On Fire". I have learned so much from the wonderful posts on this blog, including the two tips I used for my printing: making the screens from the old mat and from foamcore and spraying my prints with the soda ash solution. Another great link is from Kerr Grabowski's website - she posted a nice short video on how deconstructed screen printing is done. I can never explain it well enough. And please let me know if this post was helpful to you!