(AP Inks) are just what the name means, these inks have no bleed resistance for die migration, no stretch additives, and generally no thick opacity. Great for 100% cotton shirts or as a color on top of a white backer on a dark color garment.
(HO Inks) have a high thickness in their overall print when applied. This series has a thicker, more opaque coverage to provide a better barrier when needed. For example, on 50/50 garments.
(LB Inks) are getting a bit higher in price but you are now paying for a high-quality plastisol screen print ink. This series has bleed resistors that help the prevention of die-migration from the garment when the heat of the dry goes through the ink. Most low bleed plastisol inks have a lower cure temperature that also help from the die-migration process. WM Plastics low bleed screen printing inks cure temperature is 260 degrees which is ideal for 100% polyester garments.
(LC Inks) is an even better-quality printing ink that cures at 230 degrees. The low cure series is not for every application as the price is the highest out of all the printing inks. Benefits of this ink is the super low temperature at which the ink cures at, as well as the abundance of stretch capability already mixed in the ink. This series is best used on 100% polyester garments that are known to have a high die-migration issue.