Hi Javed..

You can use gum arabic for edible coating of fruits and vegetables. I have read some papers that studied about gum arabic in mango and tomato to delay the ripening process. 

You can download  here for tomato: https://www.researchgate.net/publication/233835852_Effect_of_gum_arabic_as_an_edible_coating_on_antioxidant_capacity_of_tomato_Solanum_lycopersicum_L_fruit_during_storage

Or you can see the paper about the effect of gum arabic coating combined with calcium chloride on physico-chemical and qualitative properties of mango (Mangifera indica L.) fruit during low temperature storage.

Beside gum arabic, trehalose, vapor gard and carnauba wax are the materials used for coating.

I hope it helps..

Article Effect of gum arabic as an edible coating on antioxidant cap...

Hi, try to find something from plant samples such as pullulan and can mix with oil based in certain percentage.

Pectin film coating was also good for enhancing the shelf life of fruits!

Moringa oil