Yes! It is usually possible and relatively easy to reproof a ski jacket. With frequent use and poor maintenance, the waterproofing can become porous, allowing moisture to seep through. In such a case, reproofing your ski jacket for optimum protection is essential.
The best way to reproof your ski jacket at home is to apply a wash-in waterproofer like TX. Direct. Most waterproofers are easy to use, safe, durable, and effective on waterproofing for wet weather clothing, including ski jackets.