Another choice is "Envirotex Lite" which is available at Michael's Craft Stores and Hobby Lobby. This is the stuff that you used to see people use a lot to

Another epoxy that I use is a finish resin called Zpoxy.  You can get enough to do the job for about $20.  It can be ordered from Tower Hobbies on-line.  I

... Rich: I have found # 9 bird shot worked the best for me. It has the smallest diameter shot size which produced a denser ballest lower in the keel. Seal it

... I used West Systems epoxy. You want 1qt. of #105A Resin and 0.44p of #206A Slow Hardner and a set of minipumps. About $67 from Jamestown Distributors. Also