My Persimmon grafts died, I found guey saap at the union but scion was dead. Thanks to Parafilm

Parafilm cracks whether you stretch it or not! My mistake was that I did not tie the union with anything else and the stock did not had enough strength to hold the scion tightly.
Also per my limited knowledge and experimental success and failures, I can testify that on Guava's best graft is to do bark graft on branches that are thicker than the scion. Cleft works on same size scion/root stock. I am yet to try t-budding, however I have a very bad patch budding where bud has about 1/4" all around exposed cambium on the branch/root stock but the scion is pushing, it amazes me! I had two buds there but one dried out, I opened the parafilm and found one dead and other bonded well and green (See pic). LOL
On Apples, appricots, plums, and Pears, my 7 year son could do the graft! all took! Sounds like the essiest to graft. I got a 7-in one Apple, 6-in-1 pear, 8-in-one plum and 7-in-1 appricot tree now. Nice!
