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TWP 100 Series and TWP 1500 Series are both oil-based penetrating wood preservatives from TWP, and they look and perform very much alike. The big difference is VOC content, which decides which one you're allowed to buy in your state. Here's how they compare, based on TWP's own product information. TWP 100 vs 1500 at a Glance TWP 100 SeriesTWP 1500 Series VOC550 g/L350 g/L VOC-regulated statesCan't be sold thereCompliant in all 50 states FormulaOriginal oil-based preservativeSame base formula, ad …