I have Purchased Stain Resistant Carpet. Do I need Scotchgard reapplied ?

Stain Resistant Carpet over the years, due to normal wear,  loses its stain resistant properties. For example, 3 year old carpet may have 75% of its stain resistant properties. It is a good idea to reapply Scotchgard to bring it back up to the 100% level of protection.