[Roadsters] Gas tank sealing and fuel lines

[Tim]

I pulled the gas tank from my second part car yesterday. It is in great shape on the outside but I still want to get it boiled out and sealed. 

My question pertains to the sealing process. I asssume it is the inside that is sealed, but what do they use and does this degrade over time because of the expsosure to the gas?

Also, once I pull the tank from my running 1600 to replace it, would blowing out the fuel lines be enough, or should I go ahead and replace them as well?

Thanks

Tim
Dairyland Datsuns