I would take him to the ped for a check up to make sure there isn't anything else going on, like a urinary tract infection that would cause him to pee a lot. Otherwise, dump the pullups. Having a crutch will just give him more incentive not to go and is confusing for him. I know this is hard, because for both my kids I got sick of having pee everywhere. My daughter was a willful 3 yo and had "accidents" on purpose. She would just refuse to go even though I knew she knew how to. Her preschool director recommended that when I knew she had to go, make her stay some place that was easy to clean up and that wasn't much fun. One day when she came home from school and had been holding it for 4 hours and was ready to burst, I told her she couldn't leave the kitchen until she went, that mommy didn't want to have pee all over my sofa and carpet. Within 5 minutes she grabbed the potty and went. We called daddy and grandma and did the works and she was pretty good with #1 after that. With my son, it was more learning when he had to pee and to stop the fun things he was doing in time to go. Every morning before preschool I ask him, "where does pee pee go?" and he shouts back "In the potty!" "Are you a baby or a big kid?" "I'm a big kid! I wear underwear! I go potty!" It took a while, about a month of soaking himself in underwear before he got it. he still has some accidents and aim issues, but we are almost there. I found he had a fear of falling into the toilet that he needed reassurance for. Since your son can do it, see if there is something he is afraid of. maybe he did fall in (my son did once, he also sprayed himself with pee once which set him back). Get some potty videos and books in his favorite characters, talk about what big kids do that babies can't. Some of my friends got favorite character underwear, like Diego or Thomas, and reminded their sons not to get their Tommys wet, if they did, "oh, Tommy is so sad, try to keep him dry next time." One friend would put her son in the plastic covered underwear pants (i have found the potty scotty underpants on the potty concepts website to be more absorbent than Gerber, just my opinion). If he stayed dry for several hours, then she let him put on his thomas underpants, if Thomas got wet, he had to go back into the plastic pants for several hours. Make him go every hour for a while, some people set a timer. Go back to rewards for being successful too. We sent in little M&Ms to preschool which he loves for successes there. Good luck, it will happen soon. he is on his way!