question of quality of acrylic tank

[robert J]

I just found a used Tru Vu 200 gallon acrylic 8'x2'x2' tank in good shape, but one of my friends told me it will not last long. After a few years it will start turning "yellowish" looking inside. The only good side he said is it never leaks. But the glass tank will become leaky some day in about 10 years or so and the front glass will always look the same. Is it true or not ? If it really is going to turn yellow looking on acrylic, is there any solutions to use to fix this problem intead of drainning the tank completely and polishing it ?