You can weatherproof your canvas jacket with the right amount of wax. But it isn't as easy as just rubbing it on.
How to Re-Wax Your Trucker Jacket
My battered Barbour: A rewaxing service to recommend – Permanent Style
How To Care For Waxed Canvas – Iron & Resin
Otter Wax Heavy Duty Waterproofing Fabric Wax
How To Re-Wax Your Barbour Waxed Jacket: Barbour's Essential Step-by-Step Guide
How To Rewax A Belstaff Jacket
How to Repair a Ripped Rain Jacket
How to Repair a Ripped Rain Jacket
Rewaxing a waxed jacket, or the story of Aulde Reekie - WellDressedDad
Caring for your Wax Cotton Jacket