I ordered two white chairs.  The assembly was easy and they looked great.   The instructions said that the chairs need to be coated with polyurethane.  What the instructions don't tell you is that polyurethane over white paint can yellow.    So now after a month on the front porch you can see shades of yellow on parts of the chairs.   Now I'll probably have to prime and paint the chairs white again.

I've read that oil based poly is what will yellow.  But I've also read that in some cases water based will yellow white paint also.  So i'll probably just skip it all together.