So, a lot of magicians have been making satire exposure videos and posting them on YouTube due to the ridiculous amount of kids revealing how tricks are done. Colloquially, we now refer to this kind of satire as "trolling". Anyways, the best way to answer your question is to ask yourself a critically thinking question: "does this make sense?" If petroleum jelly and hairspray sound far fetched... then it probably is. Another question to ask yourself is, "what affect will this substance have on my cards?"