Expanding Foam Solution. The “Expanding Foam Solution” is a polyurethane-based sealant used to fill gaps and cracks, including those between cabinets and walls. It's easy to apply, affordable, and quickly expands to provide an effective seal.
The best way to fix that would be to remove the cabinet and cut the bottom at an angle, so it sits flat on the floor and flat against the wall. Next best is to shim the front so it raises the front, tilts the cabinet, and causes the back to sit flat against the wall.
I would put some shallow shelves on the wall to the left of your vanity (maybe 2). That way you could put things like your toothbrushes and charger on it. You could also mount some hooks under the lower shelf to hang hand towels from.
A filler is a piece of finished wood used to "fill" openings or gaps between cabinets, or a cabinet and any obstruction, that would inhibit the doors or drawers from fully functioning.
Basic Trim Types
Base and Wall Filler (BF#, WF#) - Fillers are strips of wood designed to go between cabinets and structures, like walls. Base fillers are designed to mimic the shape of base cabinets. Wall fillers are straight.
Another great option is to use bathroom sealant tape when there is very little gap between a cabinet and the back wall. An easy and quick fix is bathroom sealant tape.
Cabinets also have standard installation measurements. The distance between the base cabinet (including kitchen countertops) and wall cabinet is normally between 18 and 20 inches.
Helmi Furniture Filler is great for filling in gaps on kitchen cabinets and cupboards as it's ready mixed, easy to sand, dries white, and won't shrink or crack. A good quality indoor wood primer will work well here.
Overlay fillers level out the face of your cabinets so from the face frame to the wall there are no gaps. It can add a different overall look to your design!
Spackling paste or spackle is a putty used to fill holes, small cracks, and other minor surface defects in wood, drywall, and plaster. Typically, spackling is composed of gypsum plaster from hydrated calcium sulfate and glue.
The best option for the more significant gaps behind the vanity is to install a thick backsplash. It will not only perform as the filler for the opening but also enhance the beauty of the area. A backsplash is also suitable to protect the wall from water or chemical stains while using the sink.
For example, if the gap is narrow and about half an inch thick or less, try caulking it. It's important to match the caulk color to the countertop or simply opt for a colorless one. This will ensure a seamless look. Cover the top edge of the vanity with painter's tape so you don't spill any onto the vanity surface.
Cabinet filler strips are pretty self-explanatory–they are simply strips of wood that fill gaps in between cabinets and other objects. Most of the time, filler strips go in between the cabinets and the wall. While a wall may look straight, it's probably not perfect.
Wall repair patches
If your hole is too large to fix with filler, you can use a wall repair patch. These are designed to quickly and easily cover holes in plasterboard walls. Before you apply the patch, remove any loose plaster and dust from the hole and the area around it.
What is an acrylic overlay? An acrylic overlay is a technique used to strengthen and enhance natural nails. It involves applying a combination of liquid monomer and powder polymer directly onto the natural nail plate. This mixture creates a durable and long-lasting layer that adds strength and durability to the nails.
Wood filler can be used to bridge the gap between the base cabinets and the toe kick, or the lower cabinets and the trim. Experts recommend using wood filler rather than caulk to provide a more seamless look between freshly painted trim and cabinets.
Mohawk Patchal Putty. Patchal Putty is simply the best finish putty that you will ever use. Patchal Putty is designed to be used on finished wood to fill nail holes, miter joints and cabinet seams. This putty is great for picture frames, trim and molding.
We always use a 3″-wide piece as a standard in our examples. By leaving enough space, we're making sure that we'll have enough material to install the cabinets without any problems.
Do Base Cabinets Get Attached to the Wall? Base cabinets should always be attached to the wall into the stud. This prevents them from accidentally shifting.
Upper cabinets should be at least 18 inches from the base cabinets to keep them within reach and comfortable. Most upper cabinets have multiple shelves, so it's important to keep them low enough for easy accessibility.