Handcrafted wood spatulas are the best!   
These are pretty hard to come by, as they are handmade to custom size.  Even in Japan, it is difficult to find the perfect size wood spatula for kintsugi work (as the palette is usually quite small).  Standard-size spatulas for lacquering craft tends to be a bit too wide and too long for kintsugi use, and many are made with plastic or resin.   
 
Lacquer and kintsugi artisans commonly just hand-craft their own tools, to achieve the perfect sizes of their own preference.  We have chosen 2 width, 15mm and 30mm, which is great for mixing your base on a small palette, whether it's urushi, sabi,  kokusou, or mugi. 
 
Handmade by our artisan Kai using local cherry wood.  And over time, the tools will age and patine from all your practices using oil and urushi lacquer.  (That's one of the reason why I love wood tools).   You won't find wood spatula like these in any store. 
 
With your own knife or sand paper, you can also customize it to fit your practices, whether is beveling the edge, or rounding the corner or edge for concave surface like bowls.  
 
Sold as a set of 2 (one each of 15mm and 30mm width).