your best bet is wet sand out the whole transom and re spay the whole thing. the side gunnels do not tape line that will be wetted when spraying. Tape around the cornner and spray at a angle so as not to wet the side. You may have to wet sand on the side gunnel if you get any over spray gets on it. Use 2000 grit and hand buff with a very fine compound.
Hope this helps, John