Want to show some welds on your tank? No putty needed.

Get yourself some liquid cement such as AMBROID PROWELD and some very small plastic rounds.

Lay the rounds where you want the weld and apply a bit of the cement with a fine brush. As you know capillary action will draw it around. Let that set up for a minute or so.

Now give it another coat of the cement, only this time once the plastic is soft, use the tip of your #11 blade to replicate the weld line. Let that dry and you are done.

Sorry for the lousy pictures.

Don