The best adhesive you can use is a product called Channel Bond, it's specifically made for Polycarb to Polycarb bonding and it's a one part system so no need for a gun, tips, cardridges etc., you just pour back in the container when you're done. Using a Weld-on 3,4, 16 won't do it right. I bond huge polycarb faces for electric sign faces and this stuff works wonders. You can also use it to bond acrylic to polycarb. The only place I know you can get it is here, it does ship hazmat ground uness you can find a place that has it in stock so you can avoid the hazmat shipping fee
http://www.thesignsyndicate.com/foru...-now-shipping/
I've learned that the measure of success isn't the money you make, the education you get, or the car you drive. Your success can only be measured in the amount of people in whose lives you've made a difference and the size of your heart. - Amanda Morrison [more] 
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