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  1. S

    Epoxy for fuel tanks

    I am at the point of building fuel tanks and have been looking at options for epoxy and vinylester. The most common vinylester, which I have, looks like it might not be as fuel/ethanol compatible as I thought it would be. Apparently there are types specifically designed for fuel storage...
    • Slars
    • Thread
    • fuel resitant epoxy
    • Replies: 33
    • Forum: Composites
  2. S

    Bondo in glass

    The plans I have say to use Bondo to glue the wing cores into the jigs. The first side I glued the foam cores together with micro and set them in the jigs. This worked quite well. It made for good alignment and was easy to vacuum bag the wing. Glassing the second side sets the twist in the...
  3. S

    Wing foam bonding

    I recently looked at a nicely built composite wing that I was told had the wing foam pieces glued together with a 3M spray glue before the glassing was done. The owner told me he felt it was easier than using micro as specified in the plans. Is this something that's likely to cause a structural...
  4. S

    Is this vacuum bagged layup OK?

    Here are some test layups I did. They are knitted biax (2 layers of 12oz) or knitted triax (1 layer of 21oz). The foam was painted with epoxy and no micro. The next layer is the glass, followed by peel ply, perf ply, and bleeder. I have tried 29 inches vacuum and 10 inches with almost...
  5. S

    Easy way to make your own perf ply

    When I dusted off my plans and prepared to start building my composite bird, I spent quite a bit of time trying to figure out how to do the layups. I lurked on this forum and read everything I could about how to do it and save money. Through people like Billski (thanks) it seemed there were...
  6. S

    737-900 Wing Tips

    I recently flew in what appears to be a new 737-900 with some rather odd looking wing tips. I can only guess as to the reasons for this, but maybe someone with more background could offer an explanation of this.
  7. S

    Welding, cleaners, and phosgene gas

    I came across this article while on the EAA forum and I believe this is very important for everyone to read if you use cleaning chemicals and weld. Hopefully I put it in the right place, since there is no welding specific area. The following link takes you to an article about one man's use of...
  8. S

    Engine wear

    I recently read somewhere that most of the wear on an engine occurs while starting and in the first several seconds of running due to lack of lubrication. Another comment was the worst thing you could do to your engine is to start it. This made me wonder if an electric oil pump and some valves...
  9. S

    Epoxies with different hardners

    I'm trying to decide which epoxy system to use on my project, so I have been reading everything I can find on the different epoxies available. It appears there are several epoxies that use different hardeners for adjusting the working time. Several people are mixing the different hardeners to...
  10. S

    Epoxies and cold temperatures

    I have read numerous posts about various epoxies and concerns about high temperatures, but nothing that I can recall about cold. That begs the question: Are there any concerns about flying an epoxy/glass composite airplane in the coldest part of winter?
  11. S

    Double wall fuel tank with vinylester and epoxy

    I've spent considerable time reading posts on the site and have learned so much. Kudos to all who share here. It appears that vinylester and a PVC foam like Divynicell would be a better combination for the fuel tank than epoxy. Apparently the vinylester tolerates gas and alcohol better than...
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