You've got a veneer top. If you've been reading some of the build posts, you'll know that with the veneer there can be problems with glue spots - either on the surface or seeping up through the veneer, and also all along the veneer join line. If you are dyeing/staining the top rather than spraying with a lacquer, you will need to do a check for them and remove them with a glue remover like Goof Off. The veneer is held on by a non-waterproof PVA glue, so beware of getting it too wet, as excess water has been known to allow areas of veneer to lift and bubble (which can be fixed but it's a PITA). So wipe the surface with metho or turps, which will darken the wood and show where the wood isn't taking up the fluid (because of glue). There is a high probability of glue in the join line. You won't see it all by eye alone.
Cleaning the top of glue is pretty much the first step of the build, so don't be tempted to skip it. Not all veneer tops have had this issue, but you do need to do the wetting test first to see what action (if any), needs to be taken.
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