Going to get my picnic table sorted next week. Its in the garage drying out. Ive got grey paint for it and primer. Ive got a sander but unsure on what grades to use on it yo get smooth fibish for painting. What grade should i start and finish with? And is there anything i can get to do a good painting applying the painting between the gaps? Im using superdec paint, should i use a foam roller and should i finish off with a clear coat?