Drying is typically necessary to ensure the microcapsules harden and form a stable shell that can protect the encapsulated oils. If you skip drying, the capsules may remain fragile and susceptible to rupture or leaking, which could affect the effectiveness of your scratch-and-sniff stickers.
Adding a gum arabic solution during the process could help bind the capsules to the vinyl sheet, but you would still need to ensure the capsules are sufficiently hardened before application. One option might be to partially dry the suspension, ensuring the capsules are stable, then mix them with gum arabic and apply them to your sticker surface.
This subject has similar powerlevel which you need to hardened the capsules.
