So our t1-11 siding is pretty bad, but I think we can save it. When you look in the grooves you can see where some of the wood is pulled away. I bought some glidden gripper primer and bher ultra exterior with primer. Is it a waste of money to use the primer in the bher as well? I thought it might make it stick twice as good. Looks like the last owner did a pretty bad paint job. Which it was only two years ago. Now it's cracked, but the weird part is it's stuck on fairly well, but some does flake off its strange. Wish I could load a picture. I just want a good paint job. I have been doing it by hand thus far. The glidden seems to make the surface much smoother. It's pretty rough as well.