In the earlier book it says "Use solder-filled jump rings for a
cleaner and easier application; you can also use standard jump
rings with a paste solder. In the most recent catalog it only
mentions the solder filled jump rings.
I have used the Hot Spot extensively and helped rewrite the
instructions in the 2004 Rio Grande catalog.
In short, yes you can use regular jumprings with paste solder.
However, there is one reason we recommended solder filled JR's. Time!
The clean-up is minimum, very little oxidation/discoloration. Using
paste solder oxidizes and discolors the JR's considerably. It also
takes much longer to apply the paste solder to the inside joint of
the JR accurately and in the right proportion, creating a higher
percentage of failure. And don't forget about the clean-up time.
E-mail me off list or call me and I'll be happy to go into more
I hope this helps.
Rio Grande Technical Support