What's your question? Ask

It appears your tree is suffering from an advanced case of Phytophthora; crown and root rot.
This is a fungal infection that attacks the roots of the Cherry Tree.
This link has more information.

https://ucanr.edu/repositoryfiles/ca3008p10-72022.pdf
Treating these diseases can prove difficult and can sometimes requires multiple applications of fungicidal or anti-bacterial sprays.

Plant sand cherries in a bed with full sun and fertile, fast-draining soil to encourage dense foliage growth and a deep, penetrating root system. Avoid planting them under overhanging shrubbery or trees since the shade and lack of air circulation will encourage insect pests and disease.
Feed sand cherries yearly in early spring before new growth emerges. Apply a 12-12-12 fertilizer at half strength around the base of the trunk. Water slowly and deeply after feeding to push the fertilizer deep into the soil.

https://www.gardeningknowhow.com/ornamental/trees/sand-cherry/purple-leaf-sandcherry-info.htm

This could be leafroller insect damage:
http://hortsense.cahnrs.wsu.edu/Search/MainMenuWithFactSheet.aspx?CategoryId=3&PlantDefId=61&ProblemId=55

Also check the following article to see if any of the symptoms match:
https://extension.psu.edu/pests/plant-diseases/all-fact-sheets/cherry-diseases

It appears to be a Canker on your tree and may very well be pest issues as well.

These links have more information and will help you pinpoint the issues.
https://www.gardeningknowhow.com/edible/fruits/cherry/cherry-tree-leaking-sap.htm
https://www.gardeningknowhow.com/edible/fruits/cherry/cherry-tree-diseases.htm
https://www.gardeningknowhow.com/plant-problems/disease/shot-hole-disease-fungus.htm
https://extension.psu.edu/pests/plant-diseases/all-fact-sheets/cherry-diseases

Flowers can be minimum and not last very long. Some varieties do not bloom well, especially if grown in a warmer climate.
Optimize care as covered in the article below.

https://www.gardeningknowhow.com/ornamental/trees/sand-cherry/purple-leaf-sandcherry-info.htm

As we say in the horticulture business, "the label is the law". If the label of the product you found allows cherry tree spraying, or general garden use on fruit trees, then you can use it and it should be suitable for a bark infestation. If this use is not listed on the label (for example, the spray is only for vegetables), then you can't use it on cherries. In the second case, perhaps the person who recommended the bark spray could suggest a place to find the suitable product.