Depends on what i'm gluing... Most areas of unpainted styrene. plastic...engine, heads, trans, or anything that will be painted later, straight up Testors Liquid. Works just fine.PLUS you have a short time frame to position it right. If it's an area that needs a little more time to set in the position I need...Testors Liquid, 50%, with a mix of 50% Testors Tube stirred in, OR Super Glue/Krazy Glue Gel. Metal to styrene or metal to metal? SG or KG Gel. Painted parts, that need to be "scraped" at the attached point? Same Testors Liquid. If I want parts to be literally "welded" together...Tenax Z7. Mostly used on aircraft seams. Bad stuff. Lastly, clear parts? Aleenes "Tacky Glue". Holds the part . Dries clear. I can buy a years worth of all, for what some of the exotic glues cost in a month.