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As you may know, Royalex is a five-layer plastic sandwich. Starting from the outside: vinyl (which has the color, red in your case), a thin layer of ABS (often black or green), Royalex foam (usually whitish), thin ABS, interior vinyl.
If the scratches and gouges are only in the outer vinyl and don't penetrate to the underlying ABS layers, most people just ignore them as normal wear and tear.
If the scratches penetrate to the ABS, which you can usually tell because the color will change from the outside vinyl color, folks will fill the damage with either (1) epoxy, (2) epoxy thickened with some sort of silica, or (3) epoxy plus a fiberglass patch—depending on how deep and extensive the damage is. The details on how to do this can be found in many threads on this site using the search function.
That canoe seems old and I doubt all those scratches accumulated from your one recent trip. There seem to be white areas near the stems, which is common in well-used canoes and indicates damage down to the ABS foam layer. An application of Dynel or S-glass skid plates is the usual fix for this kind of stem damage. There are several threads about applying skid plates here, too.
Painting the entire hull can make it look better after repairs, but paint eventually scratches off. There are threads on this site that discuss painting Royalex.
Other folks hopefully will chime in with more opinions and details.
