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- Dec 27, 2014
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Is JB Weld an acceptable construction epoxy for FG to FG joints? I have G5000 for fillets, but I am trying to decide what the best epoxy is for the assembly.
Thanks!
Thanks!
Keisling, thanks. That's what i was thinking.
Bat-mite, I suppose the main reason would be that I'm going to use so little of it. One package of JB Weld will probably build the whole rocket. I'll need an ounce or two to do fillets, but I'll be doing those with the G5000. To me its not worth the hassle to go through an online vendor, pay for shipping, etc, just to save $5.
40% strength of what stuff? Rocketpoxy or the best epoxy there is? Any suggestions to smoothing out fillets with jb weld?Actually JBWeld isn't really that strong. IIRC, it is about 40% the strength of the strongest stuff. But it is reasonably resistant to cracking and seems to adhere fairly well. Those are two common failure modes for bulk epoxy. It also has reasonable tolerance for a bit of mild heating. So being weaker is not usually a big deal.
Gerald
Use disposable latex gloves. It makes smoothing out fillets easy.40% strength of what stuff? Rocketpoxy or the best epoxy there is? Any suggestions to smoothing out fillets with jb weld?
Personally I don't like JB Weld, but, If you insist on using alot of it, the big tubes'll save you about 40% of your dough...https://www.amazon.com/J-B-Weld-828...sr_1_4?keywords=jb+weld&qid=1578919848&sr=8-4If you don't mind paying the exorbitant price, then it's fine. JB Weld is $5.67 per ounce, whereas RocketPoxy is $1.09 per ounce (before shipping). Why not just use the RocketPoxy? I only use JB Weld for the retainer.
Make sure you wash the surfaces with soap and water, rinse thoroughly, rough up the surface with 60-grit sandpaper, then use acetone or isopropyl alcohol to clean away the dust.
Use nitrile -- a person can become allergic to latex through repeat exposure -- no more Band-Aids.Use disposable latex gloves. It makes smoothing out fillets easy.
OMG! Obviously you don't know the dangers of salicylic acid which lurks in the willow tree.Been doing it that way for 50 years. You also are suppose to use a non toxic willow tree for roasting marsh mellows in the state of CA.
Now that is a great idea! Thanks.Definitely gloves. I always wear gloves when working with any epoxies ... 5mil nitrile gloves are about $0.05 each and in my opinion well worth mitigating the risk of developing a sensitivity to epoxy.
As for smoothing / shaping fillets ... I picked this up from a post here on TRF a couple years ago. Cake decorating tools! I mask my lines, fill, and pull the fillet with these. One pass to shape and then dip the ball in denatured alcohol and one more pass to smooth. Works like a charm! I use for wood glue also, but no alcohol dip there...
https://smile.amazon.com/dp/B0771DY1LK/ref=cm_sw_r_cp_apa_i_opghEb4KESGXN
The real question then becomes...Can you turn out a decent looking Rose petal?Definitely gloves. I always wear gloves when working with any epoxies ... 5mil nitrile gloves are about $0.05 each and in my opinion well worth mitigating the risk of developing a sensitivity to epoxy.
As for smoothing / shaping fillets ... I picked this up from a post here on TRF a couple years ago. Cake decorating tools! I mask my lines, fill, and pull the fillet with these. One pass to shape and then dip the ball in denatured alcohol and one more pass to smooth. Works like a charm! I use for wood glue also, but no alcohol dip there...
https://smile.amazon.com/dp/B0771DY1LK/ref=cm_sw_r_cp_apa_i_opghEb4KESGXN
Plus 1 on the fondant tools. Same trick as the sharpie on pvc, scribble a bunch of sharpie on the fondant ball and mark the fin/bt intersection, mask and fill. I use RocketPoxy but any decent epoxy should work well for fillets. Alcohol for epoxy, water for TNQ if you need it. Nicer fillets than I used to make.Definitely gloves. I always wear gloves when working with any epoxies ... 5mil nitrile gloves are about $0.05 each and in my opinion well worth mitigating the risk of developing a sensitivity to epoxy.
As for smoothing / shaping fillets ... I picked this up from a post here on TRF a couple years ago. Cake decorating tools! I mask my lines, fill, and pull the fillet with these. One pass to shape and then dip the ball in denatured alcohol and one more pass to smooth. Works like a charm! I use for wood glue also, but no alcohol dip there...
https://smile.amazon.com/dp/B0771DY1LK/ref=cm_sw_r_cp_apa_i_opghEb4KESGXN
@OverTheTop Are you familiar with the location & history of the Keweenaw Range? The Keweenaw Peninsula is a finger sticking out into Lake Superior. My Great Grandparents on my Mom's side of the family were Finnish immigrants who settled there. Since it is surrounded by water on 3 sides it gets a huge amount of Lake Effect Snow. The average snowfall is 220 inches each year! It's a beautiful area.FYI that is what I laminated the leading edges of my Nike Apache composite fins with. Fiberglass cloth with JB Weld as the matrix in the composite.
View attachment 422052
Here is a pic of the edges before final paint and flight.
Flight speed was M2.14.
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