Pulled out a CMR Humpty Dumpty egg lofter that I started a few years ago (1983-ish). The reason it's been sitting in a shoe box since then is that while installing the top stage motor mount I applied the epoxy with a little too much enthusiasm and melted the styrene shroud (evidence below). I'd like to finish this to celebrate the 35th anniversary of starting the build: what can I use as a filler that will adhere to the styrene but not cause any more damage? Would Bondo work? Seems like Squadren Green/White would be too strong...
Suggestions?

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SAM #0031

What great classic egglofter design! I printed the JPG attached to your post and the result came out right at 1:1. Was there any other printed materials that came with this? This design is not in the CMR section of Ye Olde Rocket Plans. Would be a nice addition.

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Buzz McD.

Avid rocketeer since 1967.
NAR 13559 / L2

Hey Buzz,


Huh - I thought I had sent plans over to Scott years ago - I've just sent them over. The only other sheet that came with the kit is for the generic pop lug (attached ). Any ideas on what to use to fill styrene?



S.

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SAM #0031

Bondo filler has even hotter solvents than squadron putty.
I would think you could use Squadron white or Testors Contour putty, but test them to see if they would melt it.
I think this would be a great application for Elmer's Fill-nFinish as it it water based and has zero possibility of melting the plastic. Yes, I have recommended a non-solvent product.

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When in doubt, WHACK the GAS and DITCH the brake !!!

Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't !
Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY.
ALL systems are GO for MAYHEM, CHAOS, and HAVOC !

Good God, GH - pigs are flying and there's a Nor' Easter down belowl!!


I'd thought about F n'F, but not sure it would adhere to the plastic don't have any on hand right now, but I'll pick some up tomorrow after work and report back.


S.

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SAM #0031

Both Squadron and Tamiya Putty were meant for plastic models, so styrene is their intended material for use. Just don’t apply it too thick. I use Bondo on a variety of materials, but usually not on plastic. But it should be fine. I know Bondo Spot Putty will crack if applied too thick, and assume the others might. I’ve always applied Squadron or Tamiya sparingly. I just build up the application where I need a thicker fill.

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Lee Reep
NAR 55948

Projects: Semroc Saturn 1B, Ken Foss Designs Mini Satellite Interceptor
In the Paint Shop: Nothing! Too cold!
Launch-Ready: Farside-X, Maxi Honest John, Super Scamp

I wouldn't use filler at all. Egglofting is generally not a drag-limited event. An authentic build would not show a high degree of finish.

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-Wolfram v. Kiparski
NAR 28643 - TRA 15520
MTMA Section #606 President

I’m not too concerned about drag, as I won’t be entering this one in any competition.
I just wanted to clean it up a bit. I’ll also need to cut out at least 1 new fin to go through- the-wall as there’ll be little flat surface to glue the fin to.

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SAM #0031

Oh OK.... Maybe then roll a truncated cone out of paper that slides over and covers the crumply-looking part. If you still want to use a filler, use epoxy and enough microballoons to make a paste. The epoxy will stick the styrene very well.

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-Wolfram v. Kiparski
NAR 28643 - TRA 15520
MTMA Section #606 President

Yeah, that makes great sense...............just my 2 cents.