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Unread 12-02-2013, 10:16
Andy A. Andy A. is offline
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Re: Bonding polycarbonate to polycarbonate

Quote:
Originally Posted by DELurker View Post
I was looking around for something else and found IPS Weld-On #4 recommended with a needle bottle applicator. From McMaster-Carr, it would be 7517A1 for 4 oz of adhesive ($8.79, water-thin) and 1902T41 for the needle bottle ($6.67). Recommendations online are to clamp the parts together and run a very tight bead of solvent down the seam, letting the adhesive wick into the joint.

MSDS #1 - http://www.curbellplastics.com/techn...c-weldon-4.pdf
MSDS #2 - http://www.tapplastics.com/uploads/p...%204%20New.pdf
The super thin glues are great for repairs of plastic parts because, as you say, you can let it wick into joints or cracks. The problem is that the thinner the glue the harder it is to control and the less tolerant it is of less then perfect fit between parts. It's just really easy to dribble it where you don't want it, and the tiniest gap between your part will result in a poor bond.

I use straight MC for repair work and #16 for making new parts or where I need a degree of gap filling. As long as you're very careful and have very clean edges, the wicking method makes for a better looking joint, for sure.