Bubbling occurs when there is insufficient joint compound beneath the tape or if loose drywall paper absorbs the moisture from the "mud" before it can dry.

It depends on the room:

Standard (Regular): Used for most living areas and bedrooms.

Moisture-Resistant (Green Board): Best for bathrooms, kitchen, laundry rooms, and high-humidity environments.

Fire-Resistant (Type X): Required by building code for garages and utility rooms.

Yes. Joint compound is highly porous, while the surrounding drywall is not. Without a primer, your paint will absorb unevenly, making the patched area noticeably visible. Use a PVA drywall primer to seal the patch before applying your final coat of paint.

Laminate: Yes, almost all laminate requires an underlayment to act as a vapor barrier and provide sound dampening.

LVP: It depends. SHORT ANSWER if you are installing over concrete, YES you will need to add a vapor barrier, if installing over plywood NO Always follow the exact manufacturer instructions.