The really don't need to be sealed - My HD came from the factory with no sealing at all - You can go to your local bike shop and pick up "Cream" which is a 3 part sealer that takes maybe 2 evenings to do - read all the instructions and don't skip or rush through any part of the process - I've also heard of a few guys I know that went to a radiator repair shop and had them do it - Bones!~
