<HTML><BODY STYLE="font:10pt verdana; border:none;"><DIV>Steve</DIV> <DIV>Don't worry 'bout it your gonna sand half of it off anyway.</DIV> <DIV> </DIV> <DIV>Jim I</DIV> <DIV> </DIV> <BLOCKQUOTE style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> <DIV style="FONT: 10pt Arial">----- Original Message -----</DIV> <DIV style="BACKGROUND: #e4e4e4; FONT: 10pt Arial; COLOR: black"><B>From:</B> Steve Barlow</DIV> <DIV style="FONT: 10pt Arial"><B>Sent:</B> Wednesday, May 07, 2003 7:45 PM</DIV> <DIV style="FONT: 10pt Arial"><B>To:</B> discussion@nsrca.org</DIV> <DIV style="FONT: 10pt Arial"><B>Subject:</B> Re: Quick building question</DIV> <DIV> </DIV>Ok guys. I did one side (bottom) thinned just a bit, and the other side<BR>(top) with the epoxy strait (it's 30 min) and it spread just fine. So the<BR>question is this...Should I bother to rip the glass off the bottom side and<BR>redo it, or just live with it? I kinda figured that the bond we're looking<BR>for here is for side load, so it may not be too big of an issue.<BR><BR>Thoughts?<BR><BR>Thanks again,<BR>Steve<BR><BR>----- Original Message -----<BR>From: "wgalligan" <wgalligan@cnbcom.net><BR>To: <discussion@nsrca.org><BR>Sent: Wednesday, May 07, 2003 5:18 PM<BR>Subject: Re: Quick building question<BR><BR><BR>> I'm with "U" PatternDUDE!!!!<BR>> I have experienced the shrinking qualities of the epoxy in some fill areas<BR>of a now departed airplane that was thinned with alcohol. If it was<BR>shrinking in a fill area imagine what would happen in a critical area like a<BR>joint or in the glass seam... could it shrink enough to pull on the center<BR>joint casueing problems... I dont know but I wouldnt want to find out.<BR>> WG<BR>><BR>> Hey epoxy cutters,<BR>> > This may be obvious, but I've seen some statements that can be<BR>misleading.<BR>> > When anything is added to epoxy, it either evaporates out or stays in<BR>the<BR>> > mix. When you add alcohol or acetone to epoxy the mixture will be<BR>thinner,<BR>> > but these solvents will severely weaken the epoxy. When we paint it on<BR>balsa<BR>> > (as in glassing wings) the solvent evaporates off, but if you use<BR>thinned<BR>> > epoxy on other applications (where the epoxy is inside a joint) the<BR>solvent<BR>> > molecules will be bound into the epoxy matrix and the result will be<BR>weaker<BR>> > epoxy.<BR>> ><BR>> > You can prove this by leaving the epoxy/alcohol mix 1/4 inch deep in<BR>your<BR>> > epoxy mixing cup. When you come back the next day, it will be cured,but<BR>> > rubbery.<BR>> ><BR>> > The best way to get thin epoxy is to start with a thin epoxy. Don't<BR>start<BR>> > with thick epoxy, unless you don't care about strength.<BR>> ><BR>> > --Lance<BR>> > > Use denatured alcohol (ethanol) to cut epoxy and be real careful how<BR>much<BR>> > > you use. Usually a few drops will thin it down a lot, and adding it<BR>will<BR>> > > take the cure time from whatever it might have been to overnight or<BR>longer.<BR>> > > You can buy it at Walmart in 1 quart cans.<BR>> > ><BR>> > > Adding acetone may thin epoxy, but it will attack foam. The only<BR>thing I<BR>> > > use it to thin is Aerogloss Dope.<BR>> > ><BR>> > > ----------<BR>> > > From: Bill Mears <bill@mears.com><BR>> > > To: discussion@nsrca.org<BR>> > > Subject: Re: Quick building question<BR>> > > Date: Wed, May 7, 2003, 9:54 AM<BR>> > ><BR>> > ><BR>> > > Can acetone ne used to cut epoxy ?<BR>> > ><BR>> > > Terry Brox wrote:<BR>> > > The view was certainly proof of that LOL<BR>> > > ----- Original Message -----<BR>> > > From: "wgalligan" <wgalligan@cnbcom.net> <mailto:wgalligan@cnbcom.net><BR>> > > To: <discussion@nsrca.org> <mailto:discussion@nsrca.org><BR>> > > Sent: Wednesday, May 07, 2003 9:12 AM<BR>> > > Subject: Re: Quick building question<BR>> > ><BR>> > ><BR>> > ><BR>> > > I think he os leaning more towards the "something" thing.<BR>> > > WG<BR>> > ><BR>> > > > Are you an epoxy expert or something? LOL<BR>> > ><BR>> ><BR>> > > BTW, Your new contest mate sure has a cute, um, shoe. LOL<BR>> > > ----- Original Message -----<BR>> > > From: Gray E Fowler<BR>> > > To: discussion@nsrca.org <mailto:discussion@nsrca.org><BR>> > > Sent: Wednesday, May 07, 2003 8:41 AM<BR>> > > Subject: Re: Quick building question<BR>> > ><BR>> > ><BR>> > ><BR>> > > Steve- Rubbing alcohol is a mixture of isopropyl and and water.<BR>Water<BR>> > ><BR>> > > bad. Epoxy hate water.......Plus amines (the epoxy hardener) really do<BR>><BR>> > ><BR>> > > not dissolve well in isopropyl. You are better off with methanol or ><BR>> > > denatured alcohol which is ethanol with a nasty taste killer so you ><BR>won't<BR>> > > drink untaxed alcohol.I do not know what epoxy you are using, but ><BR>that<BR>> > > center reinforcement is easy without cutting the viscosity. Bring > it<BR>to my<BR>> > > house I have lots of low viscosity resins.<BR>> > ><BR>> > ><BR>> > ><BR>> > > Gray Fowler<BR>> > > Principal Chemical Engineer<BR>> > > Composites Engineering<BR>> > ><BR>> > ><BR>> > > "Steve Barlow" <stevebarlow@attbi.com><BR><mailto:stevebarlow@attbi.com><BR>> > > Sent by: discussion-request@nsrca.org<BR>> > > <mailto:discussion-request@nsrca.org><BR>> ><BR>> > > 05/06/2003 10:10 PM<BR>> > > Please respond to discussion<BR>> > ><BR>> > ><BR>> > > To: <discussion@nsrca.org><BR>> > > <mailto:discussion@nsrca.org><BR>> > > cc:<BR>> > > Subject: Quick building question<BR>> > ><BR>> > ><BR>> > ><BR>> > > Guys,<BR>> > ><BR>> > > I'm doing the fiberglass reinforcement over the balsa sheeting where<BR>><BR>> > ><BR>> > > the main wings are joined on a .60 size kit. Can I use rubbing<BR>alcohol > to<BR>> > > cut the epoxy with to thin it just a bit? Do you think that would ><BR>cause<BR>> > > me any problems? It sure would make it easier.<BR>> > ><BR>> > > Thanks,<BR>> > > Steve<BR>> > ><BR>> > ><BR>> > ><BR>> > > =====================================<BR>> > > # To be removed from this list, send a message to<BR>> > > # discussion-request@nsrca.org <mailto:discussion-request@nsrca.org><BR>> > > # and put leave discussion on the first line of the body.<BR>> > > #<BR>> > ><BR>> > ><BR>> > ><BR>> > ><BR>> > > =====================================<BR>> > > # To be removed from this list, send a message to<BR>> > > # discussion-request@nsrca.org <mailto:discussion-request@nsrca.org><BR>> > > # and put leave discussion on the first line of the body.<BR>> > > #<BR>> > ><BR>> > > .<BR>> > ><BR>> > ><BR>> > ><BR>> > ><BR>> ><BR>> > =====================================<BR>> > # To be removed from this list, send a message to<BR>> > # discussion-request@nsrca.org<BR>> > # and put leave discussion on the first line of the body.<BR>> > #<BR>> ><BR>><BR>> =====================================<BR>> # To be removed from this list, send a message to<BR>> # discussion-request@nsrca.org<BR>> # and put leave discussion on the first line of the body.<BR>> #<BR>><BR><BR>=====================================<BR># To be removed from this list, send a message to <BR># discussion-request@nsrca.org<BR># and put leave discussion on the first line of the body.<BR>#<BR><BR></BLOCKQUOTE></BODY></HTML>