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What will bind/glue plastic the best?

D

DPK

Senior member
I want to glue two pieces of plastic together inside of a broken dust buster motor so the fan will spin again. What is the strongest type of glue/model cement that I can use? Is modeling cement stronger then super glue?

Thanks.
 
I've had good luck with JB Weld, but some polymers it won't stick to very well. Devcon 2-ton epoxy works pretty well for most plastics.
 
What kind of plastic?
Some thermo plastics can be welded with some toxic solvents. Which (welding) is what I think "modelling cement" tries to do. It doesn't work well at all, if it's not the right plastic. Also, the bond needs to harden, undisturbed, for a long time (week) to be strong.

Otherwise, phenolic resins (epoxy) are often the most reliable. Just clean the surfaces real well. That is very important. It also helps if surfaces are not smooth, etched, to give the resin more bite.
Superglue is not a good adhesive. It's adhesive strength is good enough, but it's ability to absorb energy is very poor. A distinct tap usually easily breaks a superglue bond.
 
There is a modeling solvent that will do the trick. I don't remember the name but a hobby store will know. I used it to build a model and said model got flung across a room and hit a wall and nothing broke.
 
it's just plastic. It's like the typical stuff used in cheap headphone bands. I also want something that will make it fully stikck in 5-10 secs
 
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