http://www.ApogeeRockets.com - Congratulations! If you've been following along in the assembly of the Apogee Components Saturn 1B model rocket kit, we've put together all the major sections. That includes the upper portion of the rocket, the SIV-B stage, and the Thrust Structure. Our next task is to get it ready for priming prior to final painting. In this step, you’ll fill any gaps on the surface of the model using the Fix-It epoxy clay.