Next on his checklist is wax to stick the feathers together and colors to paint them. He needs a total of 4 g of colors to paint them. If the feathers require 48 g of wax and right now he just needs 39 g How many grams of wax does he already have?
1. He needs a total of 4 g of colors to paint them. 
2. If the feathers require 48 g of wax

We can see that he needs 4 g of colors to paint the feathers, and we know that the feathers require 48 g of wax. However, we don't know how much wax he has. 

We can set up a proportion to solve this problem: 

48 g of wax : 4 g of colors :: x g of wax : 1 g of colors

We can cross multiply to solve for x: 

48 g of wax * 1 g of colors = 4 g of colors * x g of wax

48 * 1 = 4 * x 

48 = 4x 

12 = x 

So, the answer is that he has 12 g of wax.