you don't need to start over. Let what you have dry. And start fresh tomorrow. Use nice even strokes. Back and fourth and repeat. Start from the top and work your way down. Side to side. Watch for drips. I've messed up the backs of many tanks an you don't see it from the front. Just make sure to cover it totally. Just looks to me like you just have an uneven covered area. I'd hit it again. Don't waste the time and energy stripping it. JMO.
Good luck either path you take.
"When creating an aqua scape, strive for the beauty of imperfection, as its art and there is no wrong or right, it's left open for interpretation" James Findley