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  #11  
Old 06-12-2019, 12:42 AM
swisseagle's Avatar
swisseagle swisseagle is offline
 
Join Date: Feb 2005
Location: 20km outside of Zurich, Switzerland
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Sika will not adhere without primer!

If Sika ist glued on with primer, it wont let go ...

Epoxy has nearly no adhesion on acrylic ... if you scuff very rough, you get some, but still poor. If you have to put epoxy onto acrylic, I would use primer and scuff the primer, so you get some adhesion.
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Last edited by swisseagle : 06-12-2019 at 01:43 AM. Reason: more info, spelling
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  #12  
Old 06-12-2019, 06:22 AM
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maniago maniago is offline
 
Join Date: Aug 2014
Location: Bowie MD
Posts: 886
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I deep into Sika'ing my canopy, windshield, fairings, targa strip etc right now.

Sure seems pretty odd that its bonded to the AL but not the plexi. I cant imagine a builder priming etc one side and not the other. But then I also wonder about having sika available but using screws exclusively instead.

Are you sure its really black Sika and not just black RTV that was used? Sika with primer and activator will never let go of the plexi short of grinding, though I suppose the primer could let go from the targa strip.....
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Last edited by maniago : 06-12-2019 at 06:27 AM.
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