I agree with both the above comments. Toppik wont stain your base. And as Hersute said, you need to work with it and see if you can get what works for you.

I have used toppik at my hairline before and at times it has worked great, then sometimes it will go on too thick and look poorly, but as we mentioned - take a q tip with alcohol and dab it on it to thin out the toppik and get the desired results.

Clean up is easy. It has always just washed out for me. Never had any issues.