Might be why you have streaks. I thin every application with mineral spirits and could apply two full coats with one bottle. If you're streaks don't go away, I would continue adding coats until you at least use a full bottle.
Overall, I'm happy with SN. I treated the cladding twice over the year and used 2.5 bottles.
The only downside is that I can't seem to keep gas from dripping on the cladding under the fuel door and the cladding starts to fade in that area over time. Not a big deal but still annoying.