In this video I take an Intex whale and use mineral oil to make the toy’s vinyl become stiff and firm. I put 16 ounces of mineral oil into the whale, spread it around inside the toy, and then wait a few weeks for it to take effect. The toy become significantly stiffer and the vinyl is crinkly. When over inflated the toy gets firmer as opposed to stretching larger.
Check out the video where I use plasticizer to make an Intex whale soft and rubbery as opposed to stiff and firm:
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