Looks like you are going for hard edged camo... I would use silly putty depending on how big your kit is. I used it on my 1/35 armor kit and it came out great. I bought 3 of those at Hobby Lobby for like $1.50 each and you can use it often. Start with the base color... then go for second darker paint then finally go for the darkest paint at the end. You apply silly putty after each paint job but please make sure to allow the paint dry for more than 24 hours.