solid staining a deck
6 years for a deck coating would be considered excellent out my way
The best way to re-coat it now would be to powerwash it, scrape off any loosely adhering stain, feather sand out the scraped areas, wipe/blow off the dust, then solid stain it again
Primer would only be needed in very specific circumstances
Unless there is something you are not telling us, you shouldn't need it
If you did need it you should not use Kilz, but rather something rated for foot traffic (deck stain specific)
You could seal the bottom if you want too, but at this point it's just an option or personal preference
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