As Teak is a natural material it can be that small cracks or splits sometimes appear as a result of changes in humidity and temperature. Although slowly kiln drying teak furniture helps to significantly limit checking, teak is natural and will expand and contract, particularly in the variable climate of the UK and absorb moisture in the air which makes it swell a little.
A process called checking may occur as your outdoor furniture adjusts to its surroundings. This can result in small hairline cracks developing, usually on the end grain sections. The cracks come and go, and will eventually settle. Most importantly, they do not affect the strength and performance of the teak furniture in the long term.
You may even have larger cracks which again do not cause any structural issues to the furniture and will close again as the moisture escapes and the furniture adapts to its new environment.
If you wish, for larger cracks to prevent water ingress and to improve its appearance you can brush a small amount of pva glue into the crack and whilst drying gentlys and the area with 120 grit sandpaper. This will help to seal the crack and in most cases, will ensure the crack is no longer visible. This is optional though as in most cases the cracks will close up and settle.
