How to Prepare a Room for Painting (Step-by-Step From a Maine Handyman)

Lessons from a real Maine mudroom project — how proper prep work sets the stage before primer ever touches the wall.

If you’ve ever wondered how to prepare a room for painting, the answer usually starts long before a brush or roller ever comes out. In this Maine mudroom project, Nate Greene uncovered everything from uneven drywall to hidden drafts behind the trim — a reminder that the real work happens during prep, not just painting.

From removing old molding to smoothing walls and sealing gaps, here’s what it actually takes to get a space ready for a clean, lasting finish. As a Maine handyman working in older coastal homes, Nate often sees hidden issues that only show up once prep work begins.

Nate starts the prep process by removing old trim and clearing the walls before priming begins.

Proper prep for a room makeover means looking closely at trim, wall condition, and surface texture so paint has the best chance to adhere evenly. When the groundwork is done right, everything that comes after — from primer to finish coats — goes on smoother and lasts longer.

What Should You Remove From a Room Before Painting?

Before any sanding or priming begins, the first step is clearing the space and taking down anything that could get in the way. That usually means removing artwork, hanging hardware, and existing trim so you can see exactly what you’re working with underneath.

For trim removal, Nate kept the tool setup simple: a couple of flat bars and a framing hammer. A heavy-duty pry bar (around 10 - 12 inches) handled tougher nails and rough removal, while a smaller pry bar (about 8 inches) allowed for more delicate trim work without damaging the walls.

Using the right size tool makes a big difference. A thinner flat bar helps prevent unnecessary wall damage during removal, which means less repair work later in the prep process.

Simple tools like flat bars and a hammer make careful trim removal easier before priming and painting.

What Problems Show Up When You Start Preparing Walls for Paint?

As with many older Maine homes, removing trim revealed a few surprises — and that’s extremely common during paint prep.

Once the molding came off, it became clear that the original drywall work in this room wasn’t done cleanly. Some seams ranged from small gaps to openings more than an inch wide near the ceiling.

We took that apart, discovered that the individual who sheetrocked this room had no idea how to cut sheetrock. So it's gone from eighth-inch gaps to inch and a quarter gaps. It's a big surprise. - Nate Greene

Instead of tearing out the drywall — which would have added significant time and cost — Nate chose a practical solution. A thin piece of trim would later be installed to create a clean finish while covering the inconsistencies.

Drafts were also noticeable along the exterior walls. Because insulation above the ceiling wasn’t consistent, small amounts of spray foam were used to reduce air movement before new trim went up. Spray foam isn’t always the first option for every situation, but sometimes prep work means adapting to what you uncover once walls are opened up.

I don't recommend using spray foam other than what it's created for. But sometimes you have to utilize what will work. - Nate Greene

Unexpected issues like these are normal. Previous DIY attempts or rushed contractor work often don’t reveal themselves until trim is removed and the real condition of the space is visible.

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Prepping the mudroom walls — tapping nail holes and smoothing the surface before primer goes on. Proper prep work makes the paint finish last.

How Do You Fix Rough or Bubbly Wall Texture Before Painting?

Another major part of preparing this mudroom involved correcting the wall surface itself.

The existing paint had a rough, bubbly texture — likely caused by applying a finish coat over a porous base paint instead of using proper primer. When new paint was added, it dried unevenly and created a bubbly look across the walls.

The previous owner, he probably used a ceiling flat, which is a very dry, porous texture. And when you put a finish coat over that, sometimes it'll suck it in and create these little air bubbles. And it'll dry that way. So it's basically like coarse little popped bubbles on the wall. - Nate

To correct this, Nate hand-sanded the surface to smooth it out before priming. A sanding sponge with a fine grit worked well for general wall prep and drywall compound, while folded 60-grit orbital paper helped knock down heavier textured areas.

Using finer grit helps avoid over-sanding, especially on skim-coated drywall. After sanding, the dust was removed by vacuuming the walls and wiping them down with a towel — an important step many homeowners skip. Paint won’t adhere properly if sanding dust is left behind.

Removing old trim reveals what really needs to be repaired before sanding and primer begin.

How Do You Repair Walls and Fill Nail Holes Before Priming?

With the trim removed, the next step was repairing small imperfections.

Corners needed additional cleanup due to uneven drywall work, and nail holes were filled using a spackle knife with heavyweight spackle — DAP DryDex — which goes on pink and dries clear. This makes it easy to see when the surface is ready to be sanded again.

Dry time depends on temperature and humidity. Working in this cool entryway space in the winter, small nail holes were ready in about 20–30 minutes, while thicker repairs were left overnight to fully cure.

Choosing the right type of spackle matters. Heavyweight spackle sands easily and blends well with drywall, while vinyl spackle — although durable — can be much harder to sand smoothly for interior prep work.

Filling nail holes and small imperfections with spackle helps create a smooth surface before the primer.

How Do You Prepare a Room for Painting So the Finish Lasts?

Most of the work in this mudroom happened before primer ever touched the walls. Removing trim, correcting old drywall issues, sanding down texture problems, and sealing drafts all helped create a clean surface for the next phase of the project.

It’s common to uncover hidden problems during prep, especially in older homes throughout Maine. Taking the time to address those details early prevents bigger issues later — and leads to a smoother, more professional paint finish.

Removing old trim often reveals hidden drywall issues that need attention before sanding and primer.

What Happens Next: Priming and Painting the Mudroom

With the walls repaired, sanded, and ready, the next step in this mudroom project is priming and painting — where all the prep work really starts to pay off.

If you're searching for a Maine handyman to prepare a room for painting — from trim removal to wall repair — proper prep is what makes the final finish last.

In Part 2 of this series, we’ll walk through how Nate approaches primer selection, why surface prep affects the final color and finish, and what homeowners should know to get the best results with a brush or roller.

In the next post, we move from preparation into the transformation phase.

If you live on the Midcoast of Maine or in Southern Maine, and you need a room makeover with a fresh color and trim, reach out to Nate for a free estimate!