This is my first coaster. 
Be critical and do not hold back on any flaw. I am ok with constructive opinions. First image is before I sanded it. 2nd image is after sanding and then I coated it with Linseed oil.
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Did you turn MDF into wood by sanding and oiling? Looks like 2 different pieces.
I think the first one was a test piece
The magic of sanding! 
The wood is poplar and both images are the same piece of wood.
There was no test piece.
Maybe the lighting is causing it to look that way.
1 Like
Looks really good !! What bit did you use?
The magic of lighting to
1/16 2 flute up cut end mill
and 30° Vbit .01" (30499-01)
Both inventables bits.