I just used some old SIG Core-Bond to join pieces of pink foam for a sanding tool. Since I "inherited" it, I don't know its age. The directions called for a thin coating of each surface, and indicated about an hour time before it would be tac free and ready for the two pieces to be brought together. It also said that application tools could be cleaned with soap and water, until the stuff dried.
I took only a minute to coat the surfaces, then closed the can and took my brush upstairs to clean. I used dish detergent (not soap, as suggested) and water. The brush immediately took on a grotesque, stiff shape and lost it's flexibility. White particles appeared, some of which could be picked out, but all of which were sticking to the brush hairs - as shown. I was back in the shop within 20 minutes, and the parts were already dry. When I joined them, the bond was strong immediately. I had used this brush months ago with Brodak's butyrate dope, but is was very soft and flexible at the start.
So my question is whether anyone knows what happened to my nice art brush. Was it residue of butyrate, use of detergent, or just plain old Core-Bond setting up much faster than expected?...or something else.
Thanks, guys, for your thoughts!
SK