How to prep and apply GYEON CAN COAT.

For anyone that has used Cancoat, what advantages does this have over using a regular coating or a water activated coating? It looks like the application is similar to Sonax Polymer Net Shield. Does keeping the coating sealed in the can guarantee the coating product to remain fresher longer or indefinitely? I worry about this with other coatings where I have portions of the bottles left over. If the can insures freshness and the product is the same as the bottled product it might be a good choice for me.
 
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