[ATM] 770 primer with Loctite Prism 401

[artbianconi@blast.net]

I have been selling aircraft Vortex Generators made from GE Lexan 
for 18 years. They are used as laminar flow enhancements on 
everything from Bonneville streamliners to Icelandic speed 
skaters. On the strength of a what I'd been told by Locktight 
applications engineer, I advised end users to use the 770 primer 
before attaching the generators to the wings of aircraft. 

During a more recent conversation with a senior applications 
specialist at Locktight, we discovered that the former engineer 
was incorrect in having told me to use the 770 primer. In some 
applications, it's use is appropriate but with Lexan, the tensile 
strength of the bond is actually compromised.

I urge everyone to check the Lock Tite spec sheet for 
compatability. It helps if you know what material your part is 
made of. Also, the gel equivalent (Prism 454) should be 
considered for parts whose mating surfaces are irregular. It 
contains a filler material that bridges the gap on poorly fitted 
parts. 

McMasters - Carr is a good source. It's not sold in retail 
stores.

Art Bianconi

> The use of 770 primer with Loctite Prism 401 cyanoacrylate
> adhesive is very important. I am not sure what the mechanism
> is, but my experience is that bond is much stronger on plastics
> such as acetal  (Turcite) when the 770 primer is used.
 

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