Soda vs dustless vs sandblasting
Soda blasting uses soft sodium bicarbonate to strip coatings without damaging the surface underneath, so it suits cars, boats, aluminium, sandstone and engines. Dustless blasting mixes abrasive media with water to strip large areas fast with little airborne dust. Sandblasting uses dry, hard grit to cut heavy rust and leave a profile on steel for new paint.
Side by side
| Soda blasting | Dustless blasting | Sandblasting | |
|---|---|---|---|
| Media | Sodium bicarbonate (baking soda), softer than most surfaces | Abrasive media such as crushed glass, mixed with water | Hard, angular dry grit |
| How it removes coatings | Particles shatter on impact and lift the coating off | Wet abrasive cuts the coating; water carries the dust down | Grit cuts through the coating and into the surface |
| Effect on the surface | No profile; no warping or pitting | Light to medium profile | Medium to heavy profile, ideal for paint adhesion on steel |
| Airborne dust | Low to moderate; can be run wet | Very low | High; needs full containment |
| Speed on heavy rust | Slow; removes light rust only | Fast | Fastest |
| Best for | Car panels, aluminium, fibreglass hulls, sandstone, timber, engines, food and catering equipment | Brick, concrete, pools, large painted or rusted areas near homes | Structural steel, trailers, machinery chassis, mill scale |
| Avoid on | Heavy rust and scale (too slow) | Delicate gelcoat, thin aluminium, soft heritage stone | Thin panels, aluminium, glass, fibreglass, sandstone |
| After blasting | Rinse off alkaline residue, then prime bare metal | Prime steel quickly to stop flash rust | Prime steel the same day |
Which method for my surface?
Car body panels
Soda blasting. Strips paint without warping thin steel. Use automotive blasting.
Fibreglass boat hulls
Soda blasting. Removes antifoul without gouging gelcoat. See antifoul removal.
Sandstone
Low-pressure soda blasting. Soft stone erodes under grit. See sandstone cleaning.
Brick and concrete
Dustless or soda, depending on the coating. See brick cleaning.
Structural steel and trailers
Sandblasting or dustless. Cuts rust and leaves a profile for paint. See sandblasting.
Engines and gearboxes
Soda blasting. Degreases without harming seals or bearings. See machinery blasting.
Swimming pools
Dustless for concrete shells, soda for fibreglass. See pool renovation.
Timber
Soda blasting, often wet. Strips paint and char without gouging grain. See fire restoration.
Food and catering equipment
Soda blasting. Food-grade media, no scratching. See food equipment.
Speed and cost compared
On heavy rust and thick coatings on steel, sandblasting is fastest, dustless blasting is close behind, and soda is slowest. On paint over aluminium, fibreglass, timber or brick, soda is often just as quick, because it can run without the masking and repair work that harder media need.
Because Soda Tec charges by the hour, the fastest safe method is usually the cheapest. Soda media is used once, while hard grits can be recycled, so very large steel jobs can cost less with sand or dustless blasting.
Getting ready for paint
Sandblasting and dustless blasting with hard grit leave an angular profile that industrial primers grip. Soda leaves the surface smooth, so ask your painter which primer suits bare, unprofiled metal.
Soda residue must be rinsed off before priming. After dustless blasting, bare steel needs priming quickly to stop flash rust; an inhibitor in the rinse water buys time.
Dust, noise and neighbours
Dry sandblasting throws the most dust and needs the most containment. Dustless blasting traps dust with water and suits homes, streets and strata sites. Soda produces a fine dust that settles and rinses away, and is low in toxicity.
All three methods are loud and need full protective equipment for the operator. Read more in the soda blasting safety guide.
Common questions
Is dustless blasting the same as soda blasting?
No. Dustless blasting is wet abrasive blasting with hard media such as crushed glass. Soda blasting uses soft sodium bicarbonate. Soda can also be run wet, which is where the confusion comes from.
Which method is cheapest?
It depends on the job. Soda media costs more per kilogram, but on delicate surfaces it avoids repair work afterwards. On heavy rust, sandblasting or dustless blasting finish sooner, which usually costs less overall.
Which method is best for stripping a car?
Soda blasting for body panels, because it will not warp them. Heavier rust on the chassis or floor pans is often finished with dustless blasting.
Can one job use more than one method?
Yes. Soda Tec carries soda, dustless and abrasive media on the same rig, so the method can change between parts of a job without a second visit.