KR>polyester/epoxy
Hi Netter. I have spoken to several commercial boat builders about adding polyester onto epoxy. There answer is NO. It wont stay stuck. Then what about epoxy onto polyester. There answer is again " no " but in smaller letters. The claim is that vibration and flexing as in a boat will cause the epoxy to seperate after 12 to 18 months. There is nothing wrong with building a plane using polyester is you use the correct foam etc and can stand the smell. Essentially the impression that I got is dont mix the two. It is not necessary . Harold Woods Orillia.ON.Canada haroldwo...@rogers.com --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.537 / Virus Database: 332 - Release Date: 11/6/2003
KR>polyester/epoxy
DO NOT use polyester resin to build your KR (period) Polyester Resin, as stated below, cannot be properly bonded to/or with other adhesives. So the statement "There is nothing wrong with building a plane using polyester", has to be wrong on it's face. - Polyester Resin comes NO WHERE near having the strength of epoxy. Larry A Capps Naperville, IL -Original Message- I have spoken to several commercial boat builders about polyester epoxy. There is nothing wrong with building a plane using polyester Essentially the impression that I got dont mix the two.
KR>polyester/epoxy
I read a very comprehensive article on a web site forwarded to the NET, recently, that states the opposite of that. He states that it is a very good filler and that he applies it over a micro and resin filler. One of the resins that he uses if West Systems. This can get very confusing. Is SuperFill an Epoxy? All I know is that it is two part. N64KR Daniel R. Heath - Columbia, SC da...@kr-builder.org See you in Mt. Vernon - 2004 - KR Gathering See our KR at http://KR-Builder.org - Click on the pic See our EAA Chapter 242 at http://EAA242.org ---Original Message--- From: larry.ca...@comcast.net; KRnet List-Post: krnet@list.krnet.org Date: Friday, November 21, 2003 7:52:40 PM To: 'KRnet' Subject: KR>polyester/epoxy DO NOT use polyester resin to build your KR (period) Polyester Resin, as stated below, cannot be properly bonded to/or with other adhesives. So the statement "There is nothing wrong with building a plane using polyester", has to be wrong on it's face. - Polyester Resin comes NO WHERE near having the strength of epoxy. Larry A Capps Naperville, IL -Original Message- I have spoken to several commercial boat builders about polyester epoxy. There is nothing wrong with building a plane using polyester Essentially the impression that I got dont mix the two. ___ see KRnet list details at http://www.krnet.org/instructions.html .
KR>polyester/epoxy
So, you were able to find a great article shouting the benefits of using Polyester putty as a filler and top coat/glaze. Lets complete this learning experience, maybe you'd like to search and also discover the negatives of using said Polyester putty. After all, you owe it to yourself and those now puzzled to disclose the whole story, RIGHT? Larry A Capps Naperville, IL "You have the right to remain silent. Anything you say will be misquoted, then used against you." -Original Message- I read a very comprehensive article that states it is a very good filler and that he applies it over a micro and resin filler.
KR>polyester/epoxy
It is my understanding that there are three types of resins, polyester, vinalester and epoxy resin. Epoxy resins will not bond to polyester products but will bond to vinal-ester "sort of". The same applies to polyester products not bonding to epoxy products but will bond to vinal-ester products "sort of". So what you have is vinal-ester which will bond to both. So according to theory if you want to bond polyester to an epoxy product you would have to use a vinal-ester layer between the two products. This would not be as strong a bond as epoxy to epoxy or polyester to polyester because of the makeup of the molecules involved. Think of a vinal-ester molecule as being 1/2 poly-ester and 1/2 epoxy therefore you will get only half of the bonding strength. The above is based on information from "Fiberglass Composite materials" written by Forbes Aird Mike Turner - Original Message - From: Dan Heath To: kr...@mylist.net ; larry.ca...@comcast.net Sent: Friday, November 21, 2003 6:57 PM Subject: Re: KR>polyester/epoxy I read a very comprehensive article on a web site forwarded to the NET, recently, that states the opposite of that. He states that it is a very good filler and that he applies it over a micro and resin filler. One of the resins that he uses if West Systems. This can get very confusing. Is SuperFill an Epoxy? All I know is that it is two part. N64KR Daniel R. Heath - Columbia, SC da...@kr-builder.org See you in Mt. Vernon - 2004 - KR Gathering See our KR at http://KR-Builder.org - Click on the pic See our EAA Chapter 242 at http://EAA242.org ---Original Message--- From: larry.ca...@comcast.net; KRnet Date: Friday, November 21, 2003 7:52:40 PM To: 'KRnet' Subject: KR>polyester/epoxy DO NOT use polyester resin to build your KR (period) Polyester Resin, as stated below, cannot be properly bonded to/or with other adhesives. So the statement "There is nothing wrong with building a plane using polyester", has to be wrong on it's face. - Polyester Resin comes NO WHERE near having the strength of epoxy. Larry A Capps Naperville, IL -Original Message- I have spoken to several commercial boat builders about polyester epoxy. There is nothing wrong with building a plane using polyester Essentially the impression that I got dont mix the two. ___ see KRnet list details at http://www.krnet.org/instructions.html .___ see KRnet list details at http://www.krnet.org/instructions.html
KR>polyester/epoxy
I have used polyester fillers [on cars and Corvettes with resins] and you
can always tell by the smell [resin or fillers like Black Magic ]. So if it
smells it polyester.
Polyester is for cars or boats, epoxy is for higher stress fabrication
{planes], it's stronger and has more temperature strength. However, you can
build a weaker plane if you wont, but don't mix them in laminated areas.
Ron
- Original Message -
From: "Larry A Capps" <larry.ca...@comcast.net>
To: "KR Builders List (E-mail)" <kr...@mylist.net>
Sent: Friday, November 21, 2003 7:22 PM
Subject: KR>polyester/epoxy
> So, you were able to find a great article shouting the benefits of using
> Polyester putty as a filler and top coat/glaze. Lets complete this
learning
> experience, maybe you'd like to search and also discover the negatives of
> using said Polyester putty. After all, you owe it to yourself and those
now
> puzzled to disclose the whole story, RIGHT?
>
> Larry A Capps
> Naperville, IL
>
> "You have the right to remain silent. Anything you say will be misquoted,
> then used against you."
>
>
>
> -Original Message-
>
> I read a very comprehensive article
> that states
> it is a very good filler and that he
> applies it over a micro and resin filler.
> ___
> see KRnet list details at http://www.krnet.org/instructions.html
>
>
KR>polyester/epoxy
http://curedcomposites.netfirms.com/finish.html You know, none of this stuff is bad or good and all of it is bad and good. If you don't use the right stuff for the job, it is bad anyway you cut it. Here is a small piece of the article that can be found in the link above. Dont go crazy if you have a few deeper nicks left here and there, and dont sand flat spots or dips into your surface in order to get rid of them. They will be filled instead. For this last filling use polyester based "glazing putty" (auto paint supplies) This is very smooth creamy filler designed for minor imperfections Before you start filling go over the whole surface carefully and mark all imperfections to be filled with a pencil so you dont have too look for them while your mixed putty is curing. Mix the glazing filler in small batches, it has very short pot life so you have only a few minutes on each batch. Squeegee it on with a small metal spatula and scrape off any excess. Wet sand the spots after they cure and you are done. Please read this and then decide for yourself. I am not shouting the pros or cons of any of this, because I really don't know. I do have some polyester filler and am trying it in small spots, for filler only. My experience with trying to bond to things made with Vinyl has not been good, but you have no choice if you are using such pre-molded parts. This person shows that he has done a lot more work in this area than I have, and maybe than you have. At least it is worth considering. The polyester filler, according to my paint person, does have some advantages over some of the other fillers. I am not sure, and therefore am proceeding with caution. N64KR Daniel R. Heath - Columbia, SC da...@kr-builder.org See you in Mt. Vernon - 2004 - KR Gathering See our KR at http://KR-Builder.org - Click on the pic See our EAA Chapter 242 at http://EAA242.org ---Original Message--- From: larry.ca...@comcast.net; KRnet List-Post: krnet@list.krnet.org Date: Friday, November 21, 2003 8:21:26 PM Subject: KR>polyester/epoxy So, you were able to find a great article shouting the benefits of using Polyester putty as a filler and top coat/glaze. Lets complete this learning experience, maybe you'd like to search and also discover the negatives of using said Polyester putty.
KR>polyester/epoxy
Hang on, you said you have a pair of wing skins made from Vinyl Ester resin, well that's a horse of a different color. Did you know, epoxy resin and methacrylic acid form the base for Vinyl Ester resin; Styrene monomer is then added as a diluent to give the Vinyl Ester a lower viscosity. Promoters and accelerators are used to help initiate cure at room temperature. Vinyl esters are inherently unstable and will slowly polymerize/gel on their own. Vinyl esters are not cured or cross linked with curing agents like epoxies, they are catalyzed like polyester resins through the use of MEKP. NOTE: Vinyl Esters - Styrene component - will dissolve Styrofoam. However, this changes nothing as it relates to using polyester putty to fill with. Polyester will absorb moisture, swell and ruin your paint job. Larry A Capps KR Newsletter Naperville, IL "Quantum mechanics: The dreams stuff is made of."
