i am wanting to put a clear gel coat on my boat. Is it possible to use a brush? I have no place to spray it so thats not an option. if i brush i will have to do in small batches so it doesnt start setting up. by starting and stopping will i be able to tell start and stop lines in the finished product? I want it to look nice not necessarily perfect since i am not a professional. also, do i need to have the surface smooth or a little rough before applying gel coat? thanks in advance to everyone here that can help me