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“Primer” for a guitar body isn’t one product — it’s a sequence: grain filler for open-pored woods like mahogany or ash, sanding sealer to lock the finish down, and only then a color-ready primer coat if you’re painting a solid color. These ten real, currently-sold products cover that full luthier’s finishing stack, from dedicated guitar-shop supplies to the budget automotive spray primer many builders use instead.
| # | Product | Price | Where to buy |
|---|---|---|---|
| 1 | StewMac ColorTone Clear Grain Filler | $45-$55 | Amazon |
| 2 | Timbermate Wood Grain Filler | $20-$25 | Amazon · eBay |
| 3 | ColorTone Aerosol Guitar Lacquer Sanding Sealer | $15-$25 | Amazon · eBay |
| 4 | ColorTone Waterbase Guitar Sanding Sealer | $25-$40 | Amazon · eBay |
| 5 | Rust-Oleum Automotive Sandable Primer Spray | $6-$9 | Amazon · eBay |
| 6 | ColorTone Nitrocellulose Guitar Primer Aerosol | $15-$20 | Amazon |
| 7 | Zinsser SealCoat Universal Sanding Sealer | $10-$20 | Amazon · eBay |
| 8 | CrystaLac Clear Wood Grain Filler | $15-$25 | Amazon · eBay |
| 9 | Behlen Vinyl Sealer for Stringed Instruments | $10-$20 | Amazon |
| 10 | Dupli-Color 2-in-1 Hi-Build Filler & Sandable Primer | $10-$22 | Amazon · eBay |
The picks, in detail
StewMac ColorTone Clear Grain Filler
A dedicated pore-filling compound for open-grain woods (mahogany, ash, korina) before any sealer or color goes on — the step that keeps grain from “telegraphing” through a glossy finish.
- Formulated for open-pore tonewoods
- Clear, won’t discolor natural finishes
- Works under both nitro and waterbase topcoats
- Purpose-built for guitar bodies, not a generic wood filler
- Levels well with minimal sanding
- Pricier than a generic hardware-store wood filler
- Extra step if your wood (alder, basswood) doesn’t need grain filling
Timbermate Wood Grain Filler
A water-based, sandable grain filler popular with luthiers as a more affordable alternative to dedicated guitar-shop fillers, available in wood-matched tones for natural finishes.
- Water-based, low-odor
- Sandable once dry
- Available in multiple wood-tone shades
- Lower cost than StewMac’s ColorTone filler
- Easy water cleanup
- Takes longer to fully cure than solvent-based fillers
- Less common in dedicated guitar-finishing kits
ColorTone Aerosol Guitar Lacquer Sanding Sealer
A nitrocellulose-based sanding sealer in a spray can, applied after grain filling to lock the wood down and create a stable base for color or clear lacquer coats.
- Nitrocellulose formula, fast-drying
- 13oz aerosol can
- Sold clear for use under color or clear topcoats
- Purpose-built for instrument finishing, not repurposed hardware store product
- Sands to a smooth, even base quickly
- Nitrocellulose requires ventilation/respirator like any lacquer
- Aerosol cans cover less area than the pint-size sealers
ColorTone Waterbase Guitar Sanding Sealer
A brush/spray-gun sanding sealer in StewMac’s waterbase line, for builders finishing with waterbase topcoats instead of nitrocellulose lacquer.
- Waterbase formula, low-odor
- Compatible with waterbase topcoats
- 16oz container size
- Good option for builders avoiding solvent-based lacquer entirely
- Lower odor/VOC than the aerosol nitro sealer
- Needs a spray gun or brush setup rather than an aerosol can
- Not compatible with a nitrocellulose topcoat system
Rust-Oleum Automotive Sandable Primer Spray
A budget automotive lacquer-based sandable primer that many builders use straight from an auto parts store for solid-color guitar body finishes, applied over sanding sealer.
- Lacquer-based, sandable once dry
- 12oz aerosol can
- Available in gray, white, red, black
- Far cheaper per can than dedicated guitar-shop primer
- Easy to find at any auto parts or hardware store
- Not formulated specifically for tonewood — needs a sealed surface underneath (sanding sealer first)
- Color/finish options are generic, not luthier-specific
ColorTone Nitrocellulose Guitar Primer Aerosol
A nitrocellulose-specific primer aerosol built to sit correctly under nitro color coats without the compatibility risk of mixing an automotive-formula primer with an instrument lacquer topcoat.
- Nitrocellulose formula matched to nitro topcoats
- Aerosol application
- Sold in white and gray
- Guaranteed chemical compatibility with a full nitro finish stack
- No risk of the primer/topcoat reacting or lifting
- Costs more than the automotive Rust-Oleum alternative
- Only makes sense if you’re finishing in nitrocellulose lacquer end to end
Zinsser SealCoat Universal Sanding Sealer
A wax-free shellac sanding sealer sold at any hardware store — a widely used alternative to dedicated guitar-shop sealers, especially popular for sealing wood under a range of topcoats since shellac is compatible with almost everything applied over it.
- 100% wax-free shellac dissolved in denatured alcohol
- Universal compatibility as a barrier coat under most other finishes
- Fast drying, sold in quarts
- Cheapest sealer option here and easy to find locally
- Shellac’s universal compatibility makes it a safe “barrier coat” if you’re unsure your sealer and topcoat will get along
- Not a guitar-specific product — no luthier-oriented instructions or sizing
- Shellac has a shorter working/shelf life once mixed than dedicated finish sealers
CrystaLac Clear Wood Grain Filler
A water-based grain filler from CrystaLac’s dedicated instrument/luthier product line, positioned as a direct alternative to StewMac’s ColorTone filler for builders who want a water-cleanup option.
- Water-based, sandable once dry
- Marketed specifically for instrument-grade finishing
- Low odor compared to solvent-based fillers
- Purpose-built for luthiery like the StewMac option, at a lower price
- Easy water cleanup versus solvent-based fillers
- Smaller market presence than StewMac’s ColorTone line
- Still needs a compatible sealer/topcoat system on top
Behlen Vinyl Sealer for Stringed Instruments
A vinyl-based sealer marketed specifically for guitars and other stringed instruments, positioned by luthiers as a cheaper alternative to shellac with good moisture resistance under a lacquer topcoat.
- Flexible, high-solids vinyl sealer
- Formulated specifically for stringed instruments
- 13oz aerosol can, good atomization for spray application
- Purpose-labeled for instrument finishing, not a repurposed general-woodworking sealer
- Well-regarded moisture resistance under a lacquer topcoat
- Vinyl sealer needs the correct topcoat compatibility check, same as any sealer system
- Less widely known than StewMac’s ColorTone line outside dedicated luthier circles
Dupli-Color 2-in-1 Hi-Build Filler & Sandable Primer
A hi-build automotive filler primer that levels minor imperfections while priming, giving budget builders a one-can alternative to separate grain-filling and priming steps on a solid-color finish.
- Hi-build formula fills light imperfections while priming
- 12oz aerosol
- Sandable once cured
- Cheapest and most widely available primer in this list — any auto parts store carries it
- Hi-build formula can save a step versus filler + separate primer on minor surface flaws
- Not a substitute for real grain filler on open-pore woods like mahogany
- Automotive-grade, not luthier-tested — verify compatibility with your topcoat before committing a whole body
Buying tips
- Figure out your topcoat first (nitrocellulose lacquer vs. waterbase) — it decides which sealer and primer are chemically compatible; mixing systems (e.g., waterbase sealer under a nitro topcoat) risks the finish lifting or reacting.
- Open-pore woods like mahogany, ash, and korina need grain filler before sealer; closed-pore woods like alder, basswood, and maple usually don’t — skipping filler on the wrong wood leaves the grain visible through a glossy finish.
- If budget is the priority for a solid-color finish, sanding sealer plus a generic automotive sandable primer (like the Rust-Oleum) is a well-worn, workable combo among hobbyist builders — just don’t skip the sealer step underneath it.
As an Amazon Associate and eBay Partner, toptenpick.com earns from qualifying purchases. Prices and availability are subject to change.