you can but only if it has fully cured before putting in, now im not 100% sure on the stone effect but i did use the plasticote matt black for my lid and that worked a treat despite me not waterproofing it , i know on the back of the can's the matt black did not have a aquarium warning where as the stone effect dose, you can try it but be very very careful
i have painted about four days ago now and just put a coat of pond sealer on it to seal it as much as i can i am not siliconeing it in permanent for the reason if i need to take it out quick i can but will keep a check on ph and other levels