I build my home about 20 years ago. It has cedar siding. It has been stained twice since it was build. I see a product called Permalast. Sherwin Williams sells a product call Duration which has Permalast listed. Do you know anything about his product. They say it is long lasting. Thanks for any help you can give me.

Sherwin Williams makes good paint and that product would be fine to use, I used their solid stain on my cedar shingles and it is holding up great.