Every kitchen I reface has a few battle scars. Dings by the trash can, a gouge where a pot slipped, old hardware holes, a chewed corner from the dog. When the new doors and drawer fronts go on, those face frames and end panels are still right there for everybody to see. So the damage has to go. My go-to for that job is J-B Weld Body Filler.
Here's how I fill and sand damage with it, and the handful of things I wish somebody had told me the first time.
Why Body Filler Instead of Wood Filler?
Regular wood filler is fine for a nail hole. For real damage, like a dent in a face frame, a broken edge, or a big hole, I want a two-part filler that cures hard and sands crisp. J-B Weld Body Filler is the one I reach for first. It's my top pick for holes and damage, and it takes primer and paint well once it's sanded smooth.
What You'll Need
- J-B Weld Body Filler (filler plus its hardener)
- A plastic spreader or putty knife
- A scrap of cardboard or plastic to mix on
- A flat wood block to wrap your sandpaper around
- Sandpaper, from a coarser grit for shaping to a fine grit for finishing
- A dust mask or respirator, safety glasses, and gloves
Step 1: Clean and Scuff the Damage
Filler won't stick to grease or loose junk. Clean the area well, let it dry, and knock off any splinters or flaking finish. Give it a quick scuff with sandpaper so the filler has something to bite into.
Step 2: Mix Small Batches, and Go Easy on the Hardener
This is the big one. Use about half the hardener you think you need. I mean it. Whatever amount of hardener looks right to you, cut it in half. This stuff cures FAST, and with too much hardener it'll start setting up on your spreader before you're done.
Mix only what you can use in a few minutes. Blend it until the color is even, and follow the directions on the label.
Step 3: Build It Up Past the Damage
Press the filler firmly into the damage so there are no air pockets, then keep going. Build it up higher than the surrounding surface. You want a little hump sitting proud of the damage, because you're going to sand it down flat. If you try to spread it perfectly flush, you'll almost always end up with a low spot and have to fill it again.
Deep damage may need two passes. Let the first layer cure, then add more.
Step 4: Sand It Flat With a Block
Once it's cured, wrap your sandpaper around a flat wood block. Don't sand with just your fingers. Fingers follow the dips, and you'll end up with a wavy repair that shows the minute paint hits it. A flat block knocks the high spot down until it's level with the face frame or panel around it.
Start with a coarser grit to shape it, then work up to a fine grit so the scratches disappear. Run your hand over it with your eyes closed. If you can feel the edge of the repair, keep going. Wipe off all the dust before you prime.
Step 5: Prime and Paint
Spot-prime the repair, then prime and paint like the rest of the cabinet. If you want the full walkthrough on cleaning, scuffing, priming, and painting your boxes, read my prep guide for refinishing cabinet boxes before refacing.
Ventilate. Seriously.
Good ventilation is a MUST with body filler. Open the windows, run a fan blowing out, and wear a respirator. Sanding it makes fine dust too, so keep the mask on for that part and clean up well.
How Much Should You Buy?
A little goes a long way. A gallon lasts forever, and it's way more than you'll need to touch up the boxes on a DIY kitchen. Buy a smaller size unless you've got a lot of damage or a lot of projects lined up.
Want Me to Handle It?
I'm Christopher Webb, a cabinetmaker in San Angelo. Through Reface Texas, I put new doors and drawer fronts on your existing cabinet boxes, and new soft-close hinges come standard on every job. You can also add new drawer boxes, new slides, or a new vanity. If you'd rather not do the prep yourself, box prep and paint starts from $1,500.
Want to talk about your kitchen? Book an in-home estimate. Call me at 325-895-2709 or email thewebbranch@gmail.com. You can see more of my work on my Cabinetry page.
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