Any tips for a inframe gas tank

I have not done it personally, but I have read many writeups on how to do it by many different folks who have tried many different ideas/ techniques.
To the best of my knowledge, the way you did it then is still the best way now.
Some folks don't do the JB Weld part and it still works good. Degrease the wire wool first. It is typically oiled to prevent rust and corrosion during storage. You can also get oil free wire wool that is used for fine woodworking and avoid the whole degreasing process. Just do a couple of layers of sealer over the wire wool letting each coat cure fully between applications. This can take a few days for each coat. It is not a fast process and don't rush it.

Jim, here's the video showing how it's done:

http://youtu.be/pEaVHJ8NBTo

Wow! I have heard of Caswell but that is the first time I have seen it used.
Thank you for sharing that link, Crazy Horse.
That tank sealing method is awesome!

I've used Kreem on my Nirve and Caswell on my Felt, and I would suggest Caswell.

Ive used Caswell w great results. sealed a Micargi Falcon upper tube, and 3 handmade tanks. Works 4 me !

Make sure no water in tank. A little rust is ok. Clean w/ acetone and dry out before sealing. Make sure Caswell and tank are same temp for 24 hrs before. Mix & let set at 70 degrees plus. Make sure Caswell gets ran over areas needing sealed before setiing. Cure for 24 hrs & go is my experience