Your basic choices for glues are as follows:
>Plastic glues. Obviously enough, these are for plastic only. There are different types to fit different budgets and personal preferences: thick types (like
basic Testors squeeze tubes) tend to be really cheap, but they're messy and ineffective. Thin types (most types,
Testors Model Master brand for example) are the old reliable favourites - affordable, easy to use, and effective. Super thin types (
Tamiya extra thin,
Tenax 7-R,
Ambroid Pro Weld, etc.) are the emerging high-end glues of choice, delivering exceptional bonding, true plastic "welding" action, and superglue-like speed. They are a bit more expensive (~$3 - $5 per fluid ounce) though, and tend to require more precision and finesse, but they're the best glues I've ever used. (Tenax and Ambroid in particular) I highly recommend using some form of
Micro Brush to apply these glues with as much precision as possible.
> Cyanoacrylates (AKA Superglue). These come in all sorts of varieties, from water-thin to Jello-thick, plus a bunch of specialty formulas. Some are faster, some cleaner, some stronger... Long story short, these are your general purpose jacks of all trades - they'll stick nearly anything to nearly anything else. Look into superglue accelerators, too - one squirt of this stuff will fully cure superglue in a matter of seconds, though they tend to stink a bit. Try to find hobby or woodworking brands, they come in useful quantities - unlike that $10 per drop hardware store stuff. Also, don't spill it on cotton (like, say, jeans) - the reaction between them can be violent enough to cause burns!
> Epoxies. This is those 5-minute epoxy glues you can find in nearly any store with a paint or glue department, and similar products. They're messy, sticky, slow, require mixing, and don't really like to bond to smooth surfaces. Why mention them then?? Because they're incredibly strong, tough glues. If you've got parts that MUST stay put, these are your adhesives of choice. They're particularly good for working with resin parts.