Anti-Spatter FAQs
Practical answers on where and how to use anti-spatter products, choosing between types, and getting clean results afterwards.
What is the difference between water-based and solvent-based anti-spatter?
Water-based products use water as the carrier, so they are often non-flammable and give off fewer solvent fumes. One maker's data sheet describes its water-based spray as non-flammable and rinseable with water. Solvent-based products often dry faster and cling well, but many are flammable and need more care with storage and use near sparks.
The label tells you which you have, so check it and the safety data sheet before choosing. If you work in an enclosed space or near a heat source, a non-flammable water-based type is often the more comfortable choice.
Is it safe to spray anti-spatter on a hot torch or near an arc?
Not unless the maker says so. Many aerosol anti-spatter products contain flammable propellants or solvents, so spray them away from arcs, sparks and hot metal, and let the torch cool first. Even non-flammable types are best applied to a cool nozzle so the film lays evenly.
Use it in a ventilated place, keep aerosols away from heat and sources of ignition, and follow the warnings on the label and safety data sheet. If in any doubt, treat the product as flammable until the data sheet says otherwise.
How much anti-spatter should I use and how should I spray it?
Less is usually better. Shake an aerosol well, hold it at the distance the label recommends and spray sparingly to give a thin, even film. A thin film works better than a heavy wet coat, which can run, collect dirt and, with some products, affect the weld.
Spraying distances and drying times differ between products, so follow the instructions for yours. Wipe off any pools. If you see pores or smoke from the weld area, you may be using too much.
How do I remove spatter that has stuck despite using anti-spatter?
Anti-spatter makes spatter easier to remove but does not stop all of it. TWI notes that spatter can be removed by grinding, which is time-consuming, or quickly with a chipping hammer or spatter chisel without damaging the parent metal. Use eye protection and gloves, as loose spatter can fly off.
Spatter that sticks hard, or that appears in large amounts, is often a sign of the wrong settings rather than too little spray. Check wire feed speed, voltage, gas flow and the condition of the contact tip before blaming the product.