My hesitation in using the Aurifil 80wt for dense quilting would be the amount of lint that cotton thread would be likely to generate (compared to 100wt silk or a polyester thread such as Invisafil). My Aurifil 50wt generates much less lint than other cotton threads I have used, but it is still more than silk or poly threads. My bet is that the Aurifil 80wt is also less strong than similar weight silk or poly threads.