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What epoxy, what foam
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Mike Bergen
So I'll step in.
Several points that heed to be made. WEST System is NOT a structural resin per se. Charlie is correct in stating that it is only good to about 135F before it starts loosing strength. Jay has kindly provided my presentation that we have given several times at Sun N Fun and AirVenture. All the data is there for consideration. WEST epoxy is okay for micro application but do not use the WEST 410 microspheres as they are a plastic sphere and expand under darker colors that may be used in stripping.. I have used PTM&W, Aeropoxy, ProSet (the same guys that make WEST) and MGS. Any one of these three choices are good. The recent issue with the fuel tank failure , in another discussion, is due in part to the fact that epoxies are not suitable for auto fuel exposure. Even cured epoxies don't tolerate the ethanol exposure. If the fuel tank is built with epoxy then coat the inside as Jay has recommended. I've built the 'wet' surfaces on my fuel tanks from a chemical resistant vinyl ester resin just as an extra precaution. About Clark Foam. This is the white sheet foam that was used for a long time to build various parts of our planes. IT IS NOT a closed cell foam so it wicks fuel or what ever liquid it is exposed to. There are more suitable foams available from multiple sources in the family of PVC foams. I may be reached with source recommendations. Also, I noticed an email that came in my old mail box that I do not use anymore. Use either: dmbergen@... or dmbergen@... Cheers, Mike |
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Chris,
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Good choices. West was designed to encapsulate wood boats to protect them from rot. Structurally it has a low heat distortion point of approximately 135F. This cannot be improved with a post cure. The West Pro series is structural but I have no experience with it. Aeropoxy was formulated by PTM&W for a structural matrix for fiberglass. It has a heat distortion temperature of 157F as cured and as high as 190F with post cure or just aging on the ramp. It’s properties are as good as any room temp structural epoxy. 3 hardener speeds. Regards, On Thursday, July 28, 2022, 2:10 PM, Chris Walterson <dkeats@...> wrote:
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Chris Walterson
Correction--------- Last A foam, not surefoam. ----------- Chris
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Chris Walterson
I like to use Aeropoxi. It was recommened after Safety Poxi wasn't so safe. I have the epoxi pump so it is real easy.
I use the West epoxi system for doing the filling. It is probably good for structure also, but when I do structure I stay with the same epoxi. As for foams, there are several types depending on the part. Blue or pink dock billets are used for the flying surfaces. A type of surefoam is used on the fuselage. On my little Quickie the fuselage was made from really soft carvable foam, green in colour. Take care------------ Chris -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus |
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Hi Jay, Thanks for posting this. It is pure gold for the new guys. Ben Wilson
From: main@Q-List.groups.io <main@Q-List.groups.io> On Behalf Of Jay Scheevel
Sent: Wednesday, July 27, 2022 6:21 AM To: main@q-list.groups.io Subject: Re: [Q-List] What epoxy, what foam
Sorry, here’s the link: https://www.customtechllc.com/wp-content/uploads/2020/07/which-epoxy-for-your-project.pdf
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Mike Steinsland
For what its worth..... I once bought some foam from Composites Canada that is cut into small sguares that allow it to be shaped into compound curves The squares are held in line with fibers Probably can be bought elsewhere On Wed., Jul. 27, 2022, 9:19 a.m. Jay Scheevel, <jay@...> wrote:
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Sorry, here’s the link: https://www.customtechllc.com/wp-content/uploads/2020/07/which-epoxy-for-your-project.pdf
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On Jul 27, 2022, at 9:19 AM, Jay Scheevel <jay@...> wrote:
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There is no tape of it, but his slide presentation is very detailed yet clearly understood and is available to download from his website. Here’s the link:
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 I suggest you browse the other documents on his site as they all have valuable information. Cheers, Jay On Jul 27, 2022, at 8:40 AM, Sandaircraft <Snoboarders@...> wrote:
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Sandaircraft
Hes the one that did a presentation at the quickie meet not long ago? Did anyone tape it?
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On Jul 27, 2022, at 8:17 AM, Sam Hoskins <sam.hoskins@...> wrote:
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I suggest you get in direct contact with Mike Bergen about this. This is more complicated than can be addressed over social media. Mike is a composites expert and is giving seminars on current best practices. He's at Oshkosh this week, so you may have to wait a week or so. Sam On Tue, Jul 26, 2022, 11:54 PM Robert Schmid <robert@...> wrote: I am using mostly West System epoxy from WestMarine, and foam from ÀC Spruce, except for structural stuff, I have a little bit of special epoxy, not sure if the brand. |
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Some more details about foam and resin.
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Best regards from Germany Eugen Von meinem iPhone gesendet Am 27.07.2022 um 06:54 schrieb Robert Schmid <robert@...>:
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I am using mostly West System epoxy from WestMarine, and foam from ÀC Spruce, except for structural stuff, I have a little bit of special epoxy, not sure if the brand.
Also got my flox and micro from ACS, can send you links if needed. Do you have BID? -- Robert "TheFrisco" Schmid (408) 805-5450 www.facebook.com/TheFlyingFriscos www.theflyingfriscos.com Love building planes almost as much as flying. Latest completed build is "Loki", a Chinook Plus 2 bush plane. |
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Sandaircraft
Im sorry if im asking a repetitive question but i cant seem to find the answers im looking for, or answers that are up to date.
As im starting to gather needed items for repair of this quickie im hitting the common questions. What epoxy? What foams? |
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