I split a can of cat food between my 4 cats. It gives them a tablespoon each. I only feed it to them at night. The rest of the time they get dry stuff. They're happy and healthy.

What you might want to do with your kitty is try "Light" dry food. It'll help trim him down.

As far as spraying is concerned, it has absolutely NOTHING to do with his feeding schedule. Is he neutered? If not, there's your answer. If he IS neutered, then it's a behavioral problem.

Keep us posted.