Does a universal monomer exist?

The initiator in the powder and the catalyst in the liquid is formulated to work together. The initiator (usually benzoyl peroxide) is at 1-2%. A tiny change in this % will alter the polymerisation.

Too little initiator e.g 0.1-2% less may not be enough to polymerise all the monomer liquid. Too much, again as little as 0.1-2% more will create a faster polymerisation that can leave monomers trapped within the overlay.

They L&P system is a very sophisticated chemical formulation that needs respect.

All these details show that there is no such thing as a universal polymer powder NOR a universal monomer liquid.