I've dipped an SPS. It was a single branch on a frag disk. The disk and the lower part of the SPS were dipped. The SPS did lose color where it was dipped, but the tips sprouted into 4 branches and it regained color. For other reasons, it stopped growing and at one point I snapped the branch off. The disk is almost fully encrusted now (which includes some encrusting that was dipped). Be cautious dipping anything in h2o2 though.