Cast Tin!

Step 7 Extract, Finish!

 Either extract or destroy your mold, once everything is cooled off sufficiently, then finish the surface. You outta know that tin shrinks a reasonable amount as it cools, so you'll get some slump in the middle, where the center cooled slower. This sucks. Deal. 

I was doing a very simple casting (a block), so I didn't need any fancy finishing or anything, but at this point, feel free to polish or paint the surface. Go crazy, you've made something of metal!