Yes. If you apply Repelin directly to the Hypalon tube, it will bond to the tube and if ever you need to make a patch or glue on a fixture, it will be very difficult to remove the Repelin and your patch may not be satisfactory. Poly Guard can be completely removed so if you put it on first and then the Repelin, you can remove both if you need to. Repelin also provides extra UV protection to reduce oxidation and chalking which is common with Hypalon boats.

Repelin will not break down Hypalon but will bond aggressively which can impair patchability. Poly Guard acts as a base that can be completely stripped.

For guaranteed results I also recommend that you clean and remove all stains, oxidation and release chemicals used in manufacture from the Hypalon fabric with Speed Clean before applying the Poly Guard. The results will be worth the effort.

Speed Clean will not damage PVC and is made for all inflatable boats. It will not damage the color of the PVC, providing that the material is not already damaged. If the color is integral to the fabric and the fabric is in good shape it will not damage the color. If the color is applied to the surface, it's important to test the Speed Clean on an inconspicuous spot first to determine if will remove the paint.

Everything is optional but after going through the time trouble and expense of cleaning the boat, I would highly recommend protecting it with Poly Guard. This will reduce you need for cleaning and make it much easier to keep clean. Poly Guard will protect it from UV, suntan oil, diesel, staining, scuffs and mildew damage. It's not slippery or greasy and will not stain your clothes. It also replaces lost plasticizers to extend the life of your boat. 2 coats will last 3 to 6 months. it's recommended by most major inflatable boat manufacturers; companies like Avon, Zodiac, Brig and many more.

Poly Guard can be stripped with Speed Clean in the event of repair being required. It will not attack the adhesives or affect the patch-ability of the fabric.

Nothing lasts forever. Repelin needs to be re-applied every year, twice in the tropics.

Poly Guard protects the tubes from UV, oils, dirt, grime, etc. It is also required as a primer or base coat for the Repelin on the tubes. If you put the Repelin directly on the tubes, it will cross link to the fabric and will be difficult to remove if ever you need to do a repair or patch. By putting it over the Poly Guard on the tube, it can be completely stripped if necessary.

All surfaces need to be cleaned and stripped with Speed Clean prior to application of Poly Guard and Repelin, even brand new boats. This insures that the surface is free of all dirt, oils, release agents, oxidized material and other pollutants that could impair the application and bonding of Poly Guard. When you clean your boat prior to the next application, you will strip the Repelin and Poly Guard so that new material can be applied to your boat and not to the oxidized and spent protectors.

Layering new polishes or protectors over old is false economy. The new is protecting the old, not the boat. It will break down faster and delaminate from the boat, leaving it completely unprotected. Think of using expensive paint to paint over dirty, greasy, peeling wall paper on a wall. You're better off to strip the old paper and applying a primer before painting the wall. The wall will look better, be better protected and the paint job will last much longer.

It's important to clean your new PVC inflatable with Speed Clean prior to applying Poly Guard. When the PVC fabric was manufactured, an excess amount of plasticizer was added to act as a roller lubricant which remains on the surface. Over time this will wear away or be cleaned away but it must be removed before applying Poly Guard.

Poly Guard contains similar plasticizers so that each time it's applied, it replaces plasticizers lost to the sun and environment. This is one of the technologies that extends the life of your PVC inflatable. If, however it is applied to a new boat that already contains plasticizers on the surface, it can react and create a sticky surface that is very difficult to remove.

Regular use of Speed Clean and Poly Guard protection can extend your PVC boats life considerably, probably to the same life as Hypalon.