I have purchased, but not yet used DEI 010301 High-Temperature Silicone Coating Spray - Black based on I think the same blog post. I have the windows, tape, etc. and this is the year I will do it!
On Wed, Mar 14, 2018 at 10:31 AM, Derek McLeod via CnC-List < cnc-list@cnc-list.com> wrote: > When I replaced my portlights on my 29-2, I became quite paranoid about > the spray paint attacking the plexiglass and undermining its longevity. I > tried looking at the technical data sheets for various paints like Krylon > and found they contained chemicals that would theoretically harm the plexi. > > My approach instead was to use just Dow 795 for the entire job. The > slightly tricky part was making 3/16”x3/16”x3/4” spacers with cured 795 to > allow enough silicone between the fibreglass and plexi. The rate of > expansion between the dissimilar materials being the concern, and having > enough silicone thickness to accommodate that movement. I made up an mdf > board shaped slightly smaller than the portlights to hold it in place while > the 795 cured for 10 days or whatever it was. The mdf was wedged against > the portlights against the lifelines. > > The 795 just appears black at the overlap and the portlights have held up > for 2 years of big temperature swings in Toronto, Canada. > > Derek McLeod > Aileron > 1983 C&C 29-2 > Toronto > > On Mar 13, 2018, at 10:45 PM, Jeremy Ralph <jeremy.ra...@gmail.com> wrote: > > I hope it doesn’t undermine the VHB. Here is where I got the idea... > there is another thread somewhere about it too but can’t find it now > > “If the color of your plastic is not dark enough to hide the grey tape > (and sealant), you may want to paint the inside perimeter of the pane. This > will also protect the adhesives from potential UV attack, but the bond > strength will depend on the paint adhesion. According to some > professionals, silicone-based, high-temperature exhaust paint is both > compatible and tenacious. The area to be painted is the area exposed when > you remove the ring of film.” Don Casey https://www. > sailmagazine.com/.amp/diy/replacing-fixed-portlights > > > > On Mar 13, 2018, at 10:42 AM, Matthew L. Wolford <wolf...@erie.net> wrote: > > Won’t that undermine the bond with the 3M tape? > > *From:* Jeremy Ralph via CnC-List <cnc-list@cnc-list.com> > *Sent:* Tuesday, March 13, 2018 12:36 PM > *To:* cnc-list@cnc-list.com > *Cc:* Jeremy Ralph <jeremy.ra...@gmail.com> > *Subject:* Stus-List Reinstalling plexi windows...again. > > > My plan is to paint the acrylic underside with VHT Silicone header spray > paint. Saw this recommended on a forum somewhere . Anyone try this? Good > or bad idea? > > > From: Chuck Saur <cssau...@gmail.com> >> To: cnc-list@cnc-list.com >> Cc: >> Bcc: >> Date: Tue, 13 Mar 2018 10:00:35 -0400 >> Subject: Stus-List Reinstalling plexi windows...again. >> Happy spring?? I recall someone commented on priming and/or painting the >> smoke-tint plexiglass edge areas, prior to installing, to hide the the VHB >> and Dow 795, so all does not show through the smoke plexi against the white >> cabin side along those edge areas. >> >> I have the window dug out, whew, and cleaned up with Mechanica silicone >> remover and mineral spirits. I actually lost only three patches of knuckle >> skin. I have also sanded the receiving perimeter of the plexi where it will >> make contact with the tape and/or paint. >> >> I could not find the mention of the painting step in the archive. Has >> anyone painted this and have advice? I purchased a can of Krylon High-bond >> plastic paint in flat black. It's waiting in the barn... Thoughts? >> >> >> *Chuck Saur* >> Morning Sky >> C&C 35-3 >> >> >> > > > > > _______________________________________________ > > 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 > > >
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