UV-tech from McNett is a great protectant of UV-light on any materials used outdoors. It reduces material aging and color fading. We recommended it especially for latex gaskets on our drysuits. It extends the lifespan of the drysuits a lot, as latex parts are the most sensitive part.
It can be used on packrafts too, but this is not really necessary (material is UV-resistant). It will increase resistance to dirt too. If you do so nevertheless, make sure to clean and scrub the area with alcohol extremely well, before any repair attempts with Tesa Isotape, Tape, Patch-N-Go, Helaplast glue, otherwise it may not stick well.
Official description:
"McNett UV Tech® is a powerful protectant for use on hundreds of items including dry suit seals, packrafts, kayaks, binocular housings, boat covers and a variety of outdoor fabrics and materials. Rejuvenates synthetic and natural materials and protects surfaces from sun damage and color fading. Available in 4 fluid oz. bottle. McNett UV Tech™ Conditions, Seals and Protects Plastic, Vinyl, Rubber, PVC, Leather, Fiberglass, Hypalon® and More.
* Reduces Damage and Fading From The Sun.
* Replaces Lost Plasticizers.
* Protects For Easy Cleaning.
* Improves Appearance, Enhances Color.
* Nontoxic, Biodegradable, Nonflammable."