Oh you gotta keep on it with the paint brush while its in the sun etc etc?  so like every 30 minutes ?

they got the same stuff that is liquid, its like 2 bucks more.

http://www.amazon.com/Stabilized-Crystal-Liquid-Peroxide-HC-50409/dp/B00TP1IZDE/ref=pd_sbs_194_5?ie=UTF8&refRID=1WFY548HJGN6YJGQCPKQ

http://ecx.images-amazon.com/images/I/51YTyCv31rL._SL1000_.jpg