Just a follow-up on the Plastic Magic & pin-flow applicator, I finally got to use them the last few days!
The Plastic Magic works every bit as good as the Testors Plastic Cement I was using, as far as what I have tried to glue together with my HL tanks while working on them.
Same process as the Testors in melting the plastic where the cement is applied so it forms a weld between the parts when it dries.

I know the Testors glue above contains MEK, not sure about the Plastic Magic, as it doesn't show any ingredients on the bottle or on Deluxe Materials website, & it does have a completely different odor than the Testors glue.
Also in the mix for consideration to buy would be Ambroid's Pro Weld & Plastruct's Plastiweld too!
Some of them may be better at welding together certain plastics than others, as well as welding together different plastics to one another, but I can say the Plastic Magic does work very well. Just be sure the Plastic Magic bottle you get is the "New Formula" (currently that text shows on the bottle label), because the new formula is supposed to be safer than the old, as well as bond more types of plastics better.
Plastic Magic claims that it bonds nearly all commonly used modelling plastics including polyester, styrene, ABS, PVC, butyrate, and Polycarbonate.
Maybe all these plastic cements mentioned are so similar in how well they will work, as well as how they are used & applied (at least for styrene), it probably wouldn't be a mistake to purchase any one of them if just by selecting the least expensive of them all for using on styrene & the plastics comprising these HL tanks. When I run out of Plastic Magic at some future point, I may try either Pro Weld or Plastiweld too if either of them can be purchased for a better cost than Plastic magic, if not just for the price, at least for the sake of more comparisons!
Other than finding at least one good Testors Cement alternative, the one thing I am very glad in purchasing was the applicator this time around. I really like the pin-flow style applicator, like using a pen to draw glue lines exactly where you need them, very easy & a lot less wasting of glue.
There are several brands of these pin-flow style applicators, each just slightly different from the other & differently priced, I happened to get the Flex-I-File Touch-N-Flow applicator shown below for about $8.50 shipped to me, well worth the cost in my opinion.
~ Craig ~