My son hated painting, play dough, anything messy. Now, he seeks it. We started by putting the "stuff" in baggies sealed shit. Or paint between sheets of wax paper. This seemed to help acclimate him to the sensation. We still have issues with glue or sticky things, but its improving. We make gak and work with it from time to time. Playing games to distract from the sensation, while playing. This way he plays with it, but tends to forget the sensation at times. We also do exercises from our OT that help. Good luck! Sensory issues can be very challenging. Social stories help with transitions. (The Social Stories Book - I believe its called - helps you write a good story). Also, using "First", "Then" helps in him knowing what to expect and when. We also have a feelings chart that shows emotions, & we talk about labeling his emotions at different times. Talking about what is coming and how to be excited about the new transition also helps them transition from where they are use to and comfortable, to something new and unfamiliar which is anxiety inducing. Good luck again. Best of luck in your journey! I hope this helps...

Oh my goodness! I am not one to swear! Apparently, my auto correct has a potty mouth. Lol! Please forgive my typo. :-/