Charles: What are micro-ballons?
Steve,
That's a good question.
I honestly don't know and I really don't have to know, neither does anyone else.
Let me explain.
Micro-balloons are tiny tiny bits of "something?" almost like a powder, that you mix with Epoxy, or back in the day when we used Polyester resins. That's Old School.
I don't think what is in the container is "Glass." Maybe the answer is at Google.
Anyway, you mix micro-balloons with Epoxy and the ratio gives you a mixture that enables you to do quite a few things with it. That's why I like it.
Mix a bit with Epoxy and hardener and it still remains a strong "glue" or bonding chemicle, which BTW would be difficult to sand but remain extreamly strong. R/C .25" plywood firewalls for example.
Add a greater ratio of the mix and you wind up with a dry
"extremely light" material that can be used exactly for the use you inquired about. At the dry but sticky state, it dries quickly and is easy to sand.
SUPERFILL.
I thought about it, but blue isn't my favorite color.
Superfill is still an Epoxy and requires a two part mix, A and B just like any Epoxy. However, it's consistancy is already in paste form. I'm not sure the consistancy can be controlled.
Never used it, thought about it, I did do a quick study. Works well for those that want to use it.
Choices? Aren't choices great.
My winning game is Micro-balloons made by Top Flite. 5.99 most hobby shops. Been using it on all my R/C models and now my CL models.
I use very little because I don't like the build up or large fillers.
All these following models have
micro-balloones used on them in one place or another, especially as a filler at the wings and fuselage.
Oh, and I used no colored dope as paint.
Steve, welcome again. Buckle up and hold on to something!
Charles