I’m glad you asked this. As others have said, there are lots of people here who have used toilet bowl wax and seemed to be satisfied with it. I used it for 2 years and have come to feel very, very certain that it is a terrible thing to use and should be avoided. I can’t explain how other people have had success unless maybe there are different formulas for toilet bowl wax and the one I was using was particularly bad. I only used the cheapest one that Lowes sold, fyi.
THe problem I found, and it took a couple years for me to really understand it, was that after a few months it would start to soften and even dissolve the bark that it was on. I feel like the one I used had petroleum in it but that’s just a guess. Sometimes I would smear it all up and down a 4-8 inch scion wood I was grafting onto an existing rootstock/tree.to keep it from drying out - similar to how a lot of people dip their wood into “real” wax. after a lot of time (months) even if the graft took, the bark under the bowl wax would start to bubble up, and if you just rubbed it with a finger tip the bark would come off. Even if I used the toilet bowl wax just to cover the site of the graft, it would do the same damage.
Obviously once the toilet bowl wax ruined the bark on either the scion or the rootstock or both, it died from the location of the wax out to the tip. I’m the only one I’ve seen talk about this problem, but I saw it many, many times in 2 different years on all kinds of fruit, so I’m very certain in what I’m telling you even though others haven’t experienced it (or haven’t said so). That’s why it almost has to be that some brands/sources have different ingredients. I don’t know about that, but I know I won’t use it any more. If anyone else has seen this, I’d like to hear about it. Thanks