I`ve used quite a few tire/rubber/vinyl/plastic dressings and Duragloss 252/253 is my go to. Just the right amount of shine (closer to matte). The Duragloss leather conditioner is really good too.
Not a fan of PERL.
Don`t think it`s a big secret they are using a fulfillment company and they changed their business model , limited their line, and moved into offices .. we all are doing what it takes to survive these days