[NRVR-Members] Doing Fiberglass and vacuum bagging

Thomas Tweeks Weeks tom at theweeks.org
Sun Feb 10 21:50:51 CST 2019

Bob.. I never got a complete answer from you the other night at B&B before I had to leave... which layers to use for doing an ON-Rocket, tip-to-tip, multi-layer carbon fiber vacuum bag for my 5.5" Black Brant. 

I want a glass smooth peel ply, but also want to extract excess epoxy (West Systems), so I assume I need perforated peel?

I THINK I know SOME of the supplies below are close to what I'm looking for.. 

Perforated, Release Film or Peel-Ply?:

Breather/Bleeder Cloth:

Stretch Bagging Film:

And since I'm sealing it around 1/4 of the fincan at a time.. There was some type of sealing tape/clay stuff (like sticky-tac).. was there a brand or link you can gimme? Or was it their "yellow" or "gray" bagging leak tape?

Also.. if I'm using a shop vac and/or a harbor freight vacuum machine.. what do I need for an interface nipple (or "vacuum breech unit"?)to attach the hose to?  
Do you get a good enough seal to have a passive on/off valve above the breech to you don't have to run the vacuum for hours?


p.s. for those who have never seen this done.. it's how you get a super strong, very light fiberglass or carbon fiber fin layup. Here's a video of the mechanics.. though this isn't a tip-to-tip fin job.. it's the same process.

On Wednesday, February 6, 2019 4:37pm, "Thomas Tweeks Weeks" <tom at theweeks.org> said:

> Hey all.. I have a couple of projects that I need to do some fiberglassing and
> carbonfiberrrring.. and was wondering what folks used for good results on doing
> both unmounted fin as well as on-rocket baggging (since one of my big rockets that
> needs tip-to-tip CFings is already assembled).
> You guys use a shop vac and an on/off valve to lock the vacuum, or do you use a
> real vacuum pump like from HFreight? (or a combination)
> What are you preferred layers of peel ply (for glass-like finish, but stull pull
> excess epoxy out)?
> What about additional breather/bleeder and bagging film preferences?
> just looking through all the options:
> https://www.fibreglast.com/category/Vacuum_Bagging_Films_Peel_Ply_Tapes
> Tweeks
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