I own stripped and sand a porthole mantelpiece from varnish, putting white primer on but turns wan? lend a hand? ...

Which quilt is the best and what decorations...
Answers:    I don't know what you used for a primer but I would allow 48 hours drying time then weakly sand and prime again.The yellowing is most likely pigments from the wood bleeding into the primer. The long drying time will lock the pigments into the primer. The second coat of primer will trademark them in better. After another 2 time drying period, its geared up for the finish coats.
Bedroom Set oblige?
Sounds like you inevitability to use a primer with a sealant. I similar to the brand Kilz, but I'm sure there are other angelic ones.