What happens to my scalp if I don't wash out my Toppik daily?

It takes me a good 10-20 minutes to apply Toppik on my head and makes a mess, so I prefer to wash it out every 2-3 days. I put so much product and brush my hair quite a bit during styling so I think having to do that every day is more damaging than keeping the product in my hair and only minimally having to style it the next day. Is there any major downside of keeping the Toppik + hair product it in my hair like that for a few days?