Each teak piece is unique, with one of the highlights of natural teak being its beauty and grain. Depending on climate and exposure to elements, teak weathers to a beautiful silver-grey finish over time. The wood will expand and contract with changes in climate. Shrinking of the wood can result in hairline cracks in the assembly joints or the grain itself. This does not affect the structural integrity of the frame’s construction. The natural oils in teak may rise to the surface if exposed to rain and humidity, appearing like water stains. Oil content can vary between pieces, so oil surfacing may recur multiple times before it naturally subsides over a period of several months.