See my post on similar active thread about sunroofs. Suggested a bodywrap bandaid. They say that bodywrap vinyl film will last for 7 years.

The marine boottop tape I suggested earlier is put on boats at factory. Also used to make up stick on boat names. A sign company would have it. Never seen it deteriorate even after 25 years.

Don't put sealant on it - It will look like hell! Unless a high quality UV resistant type is used, won't last that long. There are high quality marine sealants that do work and adhere well. You would need to do a careful masking tape job as well as make sure sealant has a backing - but do this as last resort!

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Graham
85 300D,72 350SL, 98 E320, Outback 2.5