Just guessing here. I would think that doing a bunch of sanding on just a layer of micro on the foam would break the bond between the micro and foam. The foam is vey brittle and weak and I wouldn't expect it to hold up very well as you are flexing the thn micro coating while you sand. When there is glass on it you don't have near as much flexing of the glass and micro while you sand.
I wouldn't think that putting on a layer of micro before you glass would really do any more for you than putting on the micro then laying the glass on it wet. If you are really determined to have more than just the normal glass I would put on the 1.45 ounce deck cloth over the 5.8 ounce cloth. That will at least give you something that will be a lot easier to sand and fill when you are done. Brian Kraut Engineering Alternatives, Inc. www.engalt.com -----Original Message----- From: krnet-bounces+brian.kraut=engalt....@mylist.net [mailto:krnet-bounces+brian.kraut=engalt....@mylist.net]On Behalf Of Stephen Jacobs Sent: Monday, April 26, 2004 5:43 PM To: larry.ca...@comcast.net; 'KRnet' Subject: RE: KR> delaminations! Rutan has disproved hard-shelling Puffer recommends against hard-shelling .......................................................... Thanks Larry C When you quote these guys you have my full attention. Like Larry F, I would really like to understand what actually happens - why this is any different from any other 2nd lay-up. We may be missing something here - what is actually causing the problem? Where does the delaminations occur? Do we find the cloth separating from the micro surface, or do we find the micro coming away from the foam? Not sure this makes a whole lot of sense, but maybe the action of sanding the "hardshell" micro somehow disturbs the bond with the core material and this promotes later delamination (at this level). I.e - the separation occurs at the core material, but this failure is in some way caused by the two step process. Cheers Steve J Zambia _______________________________________ to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html
