Welcome. For the KR we usually are not using the peel ply for the same reason as most people use it for. We use it for a good finish that doesn't require a lot of sanding. The more normal use for peel ply is like Ed says with leaving a surface with some "bite" to is for subsequent bonding. Since the wings have two layers of glass that are cured at the same time and most of the rest of the glass is just one layer we don't do a whole lot of bonding to already cured pieces.
One of the advantages of peel ply instead of plastic wrap or something similar is that air bubbles and excess resin tend to suck up through the peel ply. If you use plastic wrap you can wind up with build ups of epoxy that need to be sanded off, particularly under wrinkles in the wrap. You can also have bubbles under it that leave resin starved areas where the bubbles were. I have used Saran wrap and bagging film with success on smaller areas and even some larger areas. It is particularly good for repair work where you can stretch it over the repair and come out with something that matches the original surface with almost no filling and sanding required. I have even done this with just plastic packing tape right over the wet resin. I have done most of my new layups over foam without peel ply or anything with good results also. Brian Kraut Engineering Alternatives, Inc. www.engalt.com -----Original Message----- From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net]On Behalf Of Ed Hollestelle Sent: Thursday, January 05, 2006 11:46 AM To: 'KRnet' Subject: RE: KR> Fiberglass laying Hi there, I am not a KR owner but I was interested in purchasing one a few weeks ago, so the seller passed the group address on to me to see what this airplane is all about.(Looks like a beautiful airplane but a little hot for my strip behind the house.....) I am actually building an RV-6 after building three composite gliders. My son is an AME (I think you call them A&P) and operates a composite repair shop. Please never use wax paper instead of peel ply........... It leaves traces of wax to which nothing will bond. It also leaves a smooth surface, not suitable for bonding. Leave the peel ply on until you are ready to bond the next layer, that way you have a perfect dust, dirt and oil free bonding surface. Make sure to remove! There was a fatal accident a few years back (at Centralia Airport just North of here) during the initial flight of a composite homebuilt. The investigation found peel ply that was not removed during the lay-up of some critical parts! We use the peel ply that has red tracers to make sure it gets removed. Serge Vidal should be able to get peel ply at any glider repair shop in France. Ed Hollestelle. -----Original Message----- From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On Behalf Of VIRGIL N SALISBURY Sent: Thursday, January 05, 2006 11:10 AM To: kr...@mylist.net Subject: Re: KR> Fiberglass laying Ken Rand used waxed paper to do that. Peel ply is used to avoid sanding when joining two parts, Virg I believe it is DACRON cloth On Thu, 5 Jan 2006 16:13:05 +0100 Serge VIDAL <serge.vi...@sagem.com> writes: > I bought some BID fiberglass today in a shop in Paris that sells all > sorts > of composites mainly for artists and designers. I was also looking > for > peel ply. The guy had never heard of it. When I explained the > purpose, he > showed me rolls of rigid plastic sheets (looking like old overhead > projector slides). He said that's what his customers use when they > want > the cured surfaces to be smooth. > > That puzzles me. How come we don't do that? Is it because they fear > > trapped bubbles less than we do, or what? > > Serge Vidal > KR2 "Kilimanjaro Cloud" > Paris, France > _______________________________________ > Search the KRnet Archives at > http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net > please see other KRnet info at http://www.krnet.org/info.html > > Virgil N. Salisbury - AMSOIL www.lubedealer.com/salisbury Miami ,Fl _______________________________________ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html _______________________________________ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html
