How to Choose Sandpaper, Sanding Blocks, and Sponges

Sandpaper is half the job. The other half is what holds it. Get either one wrong and you’ll fight scratch marks, sanding waves, and paper that wears out before it should. The right pairing — abrasive matched to material, block matched to surface — is what separates a clean finish from a frustrating afternoon.

For broader project planning, explore WBC’s tools resources.

Here’s the plain answer for most building work: grab aluminum oxide sheets for general wood, metal, and plastic. Step through your grits in order. Hold the paper on a block or sponge that fits the surface. That covers the bulk of what a remodeler, painter, or finish carpenter runs into.

Picking the Abrasive and the Grit

Aluminum oxide is the workhorse for general-purpose sanding across wood, metal, and plastic. It’s what most all-around sheets use, and it’s what you’ll reach for on the majority of jobs.

For wet jobs and fine finishing, look to wet/dry paper. High-quality blocks and sheets let you work in damp situations with waterproof abrasive sheets, backed with a durable waterproof paper backing that supports both wet and dry applications. That matters in Montana, where indoor finish work happens through long winters and damp shoulder seasons. Wet/dry sheets come in a useful run of fine grades — 220, 320, 400, and 600 — for paint prep, between-coat sanding, and final smoothing.

Grit selection comes down to the stage you’re at. Coarse grits hog off material fast. Fine grits refine. The 9x11 sheet range covers it: 60 and 100 grit for heavy removal, 150 and 180 for general smoothing, 220 for finer work, and ultra-fine 1500 for the final polish. Assorted packs are a sensible way to keep the full ladder on hand.

The grit ladder is where most DIY jobs go sideways. For best results, sand with the grain of the wood, working through a sequence of grits from coarse to very fine — do not skip more than one grit between each sanding step. Jump too far between grits and the finer paper won’t erase the scratches the coarse paper left. No amount of polishing fixes a skipped step. Work the sequence.

Drywall gets its own paper. Dedicated drywall sanding sheets — in fine grades and in 100-grit for heavier joint-compound knockdown — come pre-cut to fit hand and pole sanders. Hook-and-loop drywall sheets and clamp-on styles round out the options for whatever sander you’re running.

Grit	Grade	Typical use
60	Coarse	Heavy stock removal
100	Medium-coarse	Rough smoothing, drywall
120	Medium	General smoothing
150–180	Medium-fine	Pre-finish smoothing
220	Fine	Finish prep
320–600	Very fine	Between coats, wet sanding
1500	Ultra-fine	Final polish

Blocks vs. Sponges vs. Stikit and Hookit

The tool holding the paper controls how pressure lands on the surface. That’s the part people skip when they sand freehand — and it’s why freehand work leaves uneven results.

A rubber sanding block is the baseline. The pliable rubber block conforms to the surface and keeps sandpaper flat, helping ensure consistent results without “sanding waves,” and it’s sized and shaped for comfort and control. Internal attachment pins hold the sandpaper firmly to the block, which prevents it from sliding and helps prolong the life of the sheet. The common size is 2-3/4 by 5 inches, and rubber blocks come in both 8 inch and 5 inch lengths to accommodate different projects. A clip-on attachment system makes changing sheets simple, the firm pad distributes finger pressure evenly, and the materials resist long-term wear.

The Stikit block solves the paper-swap problem. It distributes pressure evenly for more control, with a comfortable grip — sharpen corners with the flat edge, sand contours with the rounded end. The clever part is the dispenser function. The block doubles as a dispenser: when your abrasive is tired, lift it, pull more from the feed roll, stick it down, and shear off the used paper — and with the Stikit adhesive system you use all the abrasive from the roll because you don’t need to wrap it around the block. Less waste, faster reloads. It handles flat surfaces — wood, plaster, wallboard, metal — and prepares new and previously painted surfaces.

The Hookit Dust Free block earns its keep on indoor jobs. It uses the Hookit attachment system for easy abrasive changes and has small holes for use with a vacuum attachment to reduce dust and loading. For winter remodels with the windows shut, that dust control is the difference between a livable workspace and a mess. Best of all, you can reuse abrasives that still have a useful service life — simply save the partially used sheet until your next project. Connected to a vacuum and used with dust-free pads and abrasives, it pulls dust from the workpiece for improved efficiency and a cleaner working environment.

Sponges go where blocks can’t. The durable sanding sponge gets the job done fast with premium grits, the pliable design lets you get into hard-to-reach places, and a unique coating resists clogging for long use. A common dual-grit sponge runs 3-3/4 by 2-5/8 by 1 inch with fine and medium faces. The sponge won’t discolor the surface you’re sanding, conforms to your surface for easier sanding, resists clogging for longer life, and is great for construction, woodworking, carpentry, and home improvement projects like paint and drywall sanding. When you’re done, simply rinse the sponge and reuse it.

Frequently Asked Questions

Why do my scratch marks show through after sanding? Most likely a skipped grit. Work from coarse to very fine and don’t jump more than one grit between steps — finer paper can’t remove scratches left by paper that’s too coarse. And always sand with the grain of the wood, not across it.

Can I use the same sandpaper for wet and dry sanding? Many sheets and sponges handle both. Wet/dry paper is built with a waterproof backing that supports damp work, and most sponges rinse clean and reuse. Check that the product is labeled for wet use before soaking it.

What block should I use for curved or contoured surfaces? A rubber block conforms to contours, and a Stikit block gives you a rounded end specifically for curves and a flat end for corners. For tight spots and irregular shapes, a sanding sponge flexes into places a rigid block can’t reach.

How do I keep dust down on an indoor winter project? Use a Hookit Dust Free block with the small vacuum holes and a vacuum attachment. It pulls dust off the workpiece as you sand, which keeps an enclosed workspace cleaner when the windows are closed for the season.

What grit should I start with on bare wood? Match the start to the condition. Rough stock or heavy material removal calls for 60 or 100 grit. For wood that’s already reasonably smooth, start around 120 or 150, then step up through 180 and 220 for a finish-ready surface.

Does the block really make a difference, or is the paper what matters? Both matter. The paper does the cutting, but the block controls how evenly pressure lands. A block keeps the sheet flat to prevent sanding waves, distributes finger pressure so you don’t gouge, and holds the paper so it lasts longer. Freehand sanding gives up all three.