Thermoquad phonelic bowl

If they feel solid, you could go over them with a product called Seal All. Most all the parts stores carry it. It's a very strong adhesive and is impervious to gasoline. You can take a small brush and brush it around the joints and let it cure. I warn you though, be prepared, because it's thin and runny and will make a mess if you're not ready for it. But the stuff flat works.