as another member has already mentioned that the quality of this product has changed.
Have you a link to that particular comment please? You got me a bit worried as Squadron is my No 1 choice as a one part "putty". Actually I hadn't noticed the packaging changed until now -it looks like the last tube I had was "new style" print layout, but still an old style cap. I'm waiting on more coming so we'll see if there's any difference with this tube -the only problem I've had with it in the past is if you use too much at once -but thats the same problem for just about any filler really.
My No 2 product (pretty equal to Squadron) is Testors Contour Putty. It's slightly thinner than Squadron. Still dries quick, hard and sands very easy.
Deluxe plastic putty: waterbased (hmm = I can't tell the difference between it and decorators caulk from BnQ). Not a fan. I think Deluxe like Apple, have a superb marketing department. Might be OK on wood or card bt not tried. Only tried one tube on plastic so far, won't bother with it again even if it's the last thing left in the drawer.
2k e.g. polyester based I don't think is comparing apples with apples. Sure for a big area, but from OP description I don't think I'd crack my bag of Dolphin Glaze or P38 open for a few small spots to fill.
Try the Testors -it's on Ebay etc and not too expensive.
Rich