I have recently pulled out my stash of unframed cross stitch and punchneedle pieces. It occurred to me, that antiquing the cloth regardless of the method, the ph stability of the needlework has changed forever. Keeping this in mind, you will want to still conserve the art work the best you can. If at all possible, avoid putting the needlework under glass.
For those of you who like to extremely antique your primitive stitchery, you can use the sticky board to mount your needlework. Since the Extreme Primitive look is what you are after, the sticky mounting board and glass will only add to the look over time.
Since I am not quite sure what ingredients are in the product call Distress It, I would use it on pieces of needlework you would not mind if they are not conservation framed. What a great product for some of the DMC threads that may be too bright for your taste. Go ahead and cross stitch or punchneedle your pattern with the thread you are going to distress. Spray a good amount of Distress It to saturate the threads on the cloth and let dry. If you want it darker, repeat until you get the look you want.