I used 3/8 (10mm). Found a similar hard epoxy was used from the original build, which I removed and frame cleaned up back to fibreglass, using finger sander and ΒΌ sheet sander, and dremmel
Then used Sikalfex 295, with their thinner and cleaner. Make up 3 external guides to push the window to the curve in the frame. They pushed against the genoa track and the shroud turnbuckle bases. Once set it is better than new. Make sure that you allow lots of gap at the ends of the new windows to allow for the thermal expansion difference between plexi and fibreglass. 295 stays flexible and will allow movement yet keep the seal. Did my Stbd windows last winter and will complete the port ones this winter. Remember to get enough 295 to satisfy the formula; 1 tube for the work + 1 tube to get on everythingandeveryonewithin a 3m radius = 2 tubes John LF 38 #234 Echoes From: CHARLES SCHEAFFER [mailto:[email protected]] Sent: November-16-19 1:54 PM To: [email protected] Cc: Patrick Davin Subject: Re: Stus-List Thickness of acrylic cabin windows on LF38? If you had bolts through the windows, that's not a factory method corroborating your idea they were probably replaced at some point. FWIW, My 34R windows are 1/4" think. I wanted to go thicker but got the new material cut the same as the original thickness to bend the easier and to match original specifications. Glad I did. The material is very stiff. Haven't started yet. Chuck Scheaffer, Resolute, Pasadena Md On November 15, 2019 at 9:22 PM Patrick Davin via CnC-List <[email protected]> wrote: Thanks for the replies, sounds like I can use either 3/8" or 1/4". I'm going with 3/8" (9mm) for the extra strength and so it will be flush with the exterior hull surface. The actual sizes from Acrylite are in mm, I just measured in inches out of habit. I have one window pulled now (it came out quite easily, fortunately, after thrubolts were removed). The prep / cleanup looks like it's going to take a long time, as expected but maybe a bit worse than expected. This plexus stuff is a *pain*. On the surface closest to the old window was a black rubbery sealant, which comes off easily, but below that is some kind of black / brown hard epoxy. From prior threads ( http://cnc-list.com/pipermail/cnc-list_cnc-list.com/2015-February/073099.html ) I understand this is a methacrylate adhesive, aka Plexus (the brand name). Robert H in the prior thread decided to just fair over it, which I may have to do as well in some places. Another thread that discusses the Plexus headache is by Gary Russell - http://cnc-list.com/pipermail/cnc-list_cnc-list.com/2015-December/080369.html His experience was a bit different though (he had a very hard time separating the old acrylic from the Plexus), which makes me think maybe our windows have been previously replaced, and a sealant was used on top of the Plexus. It sounds like he used a router or RotoZip to cut off the plexus. We shall see (this will take a while). -Patrick _______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
_______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
