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Re: [PSUBS-MAILIST] Dome adhesive

Warning!

I talked with a knowledgable vendor at one time last year about using UV adhesives with acrylic.  He said they work well, but to his knowledge they are all degraded by exposure to seawater!  His advice was to make sure to additionally seal them with RTV or some other non-mechanical sealant if we were to use UV adhesives.

Mark



Kyle wrote:
I had my K-250 dome annealed by Greg Cottrell and also had the retaining ring (hatch) powder coated.  He suggested I use Sikaflex-295 UV as the sealant/adhesive between the dome and ring and the following instructions were from an email to me that he said I could share.
 
"The 3 items should be 226 cleaner (window and seat), then 209 primer (window and seat), then 295UV adhesive (a big fat bead in the corner of the seat). It's a good idea to use a few small 1/16 rubber shims between the window and seat so the adhesive doesn't all squeeze out. I usually mask off the window with two half circles of vinyl mask (from the local sign shop) to keep adhesive off the viewing area. You can wipe off the excess around the window while it is soft and pull the vinyl off later. Some guys let the excess harden and then cut it off later with a knife- this is a bad idea because it scores the acrylic and can cause it to break under pressure. Scratches/ cuts on the inside are not good."
The Items he is referring to are all Sika products.  The process went smoothly I used small pieces of 1/16 inch o-rings as my shims.
Kyle
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