Would love the addition of :
Holy varnish (divine damage) source is difficult to really imagine, but adding a dungeon full of good aligned outsiders might be an idea.
Unholy varnish ( negative energy damage) increasingly difficult and rarer undead to make the various varnishes.
Entangle AoE varnish wiith a "slow" on hit property Reaver musk/mucus ingredient
Poisons: Increasing DCs based on the spider glands harvested, maybe the rarest/greater varnish being DC 30 fort or thereabout. Duration is short, on hit only.
Web AoE varnish Spiders as well.
"Stun" on hit varnish. source is Greater Aragat. and the duration is very short, one or two rounds. DC reasonable, just like the actual monster.
Sonic damage varnish: either "daze" effect or on hit Sonic damage or both
((will edit this post when i get time and clean it up and add to it, but wanted to get them all down)