UV stabilization of acrylic coatings

I am told that Ciba-Geigy's "Tinuvin" range of
ultra-violet stabilizers has less than 5 years
life expectancy.
Should UV stabilizers be added to clear acrylic coatings
(such as Acryloid/Paraloid B67 or B72) and if so are there
any stabilizers with a longer life expectancy.

I take this opportunity to wish all of you out there a
very Merry Christmas and a Happy New Year.

Mark G. Vine
Conservation Resources
England

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                  Conservation DistList Instance 9:50
                Distributed: Saturday, December 23, 1995
                        Message Id: cdl-9-50-003
                                  ***