It's well to remember that no material or method is "fool proof". All can be mis-applied to the point of failure. What works well for one person may not give optimal results in the hands of another. We should, each of us, run our own tests to our own satisfaction !!
Painters who pose cart-before-the-horse problems have not done their "homework" in the form of running their own tests. Naturally, things like an adhesive saturating a substrate, then bleeding back through a coating (the masking tape under priming mentioned above) can be "wild cards" that arise "accidentally" regardless of one's knowledge and experience.
A well-made "young" oil painting is not a fragile item. It requires either incorporating an inordinate amount of brittle elements (such as hard resins) into paint films to make them brittle and inflexible inside of 80 years . . . painting on a "loose" canvas, then stretching it over a frame is no more problematic than stretching pre-primed canvas.
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