If there is one thing that prevents people from getting into resin 3D printing, it is the post-processing. Dealing with sticky, uncured resin and gallons of highly flammable Isopropyl Alcohol (IPA) can turn a fun hobby into a messy chore.

To solve this, manufacturers introduced Water-Washable Resin. But is it really better than standard resin? Does it sacrifice detail or strength for convenience? At QTS USA, we manufacture both types. In this guide, we will compare water-washable resin against standard IPA-washed resin so you can decide which workflow is right for your setup.

1. The Traditional Workflow: Standard Resin + IPA Wash

Standard UV resins (like our QTS Basic CP V2 or HD 8K Pro) are hydrophobic. They repel water, meaning you must use a solvent to dissolve the uncured resin left on the surface of your print. The industry standard is 91% to 99% Isopropyl Alcohol (IPA).

The Pros: Standard resins offer the widest variety of mechanical properties. If you need extreme toughness, high heat resistance, or ultra-flexibility, you must use a standard resin. IPA also evaporates rapidly, meaning your print is dry and ready for final UV curing almost immediately after washing.

The Cons: IPA is highly flammable, emits strong fumes, and requires careful ventilation. It is also an ongoing consumable cost. Furthermore, IPA can be harsh on the skin and requires proper PPE (nitrile gloves) to handle safely.

2. The Convenient Alternative: Water-Washable Resin

Water-washable resins are formulated with hydrophilic oligomers, meaning they can be dissolved and washed away using ordinary tap water.

The Pros: The primary benefit is convenience and safety. You eliminate the need to store gallons of flammable IPA in your home or classroom. There are significantly fewer fumes during the washing process, making it much more pleasant for indoor use.

The Cons: Early generations of water-washable resin were notoriously brittle — drop a miniature, and it would shatter like glass. They also tend to absorb moisture from the air, which can cause prints to crack over time if not sealed properly.

Note: Just because it is "water-washable" does not mean it is drain-safe. Never pour uncured resin water down the sink. You must cure the dirty water in the sun and filter out the solid plastic before disposing of the water.

3. The QTS Solution: Water-Washable V2

We recognized the brittleness issue with standard water-washable resins, which is why we developed the QTS Water-Washable V2 Resin ($46.99/kg).

The V2 formula utilizes a modified polymer chain that significantly increases impact resistance and toughness. While it is not quite as strong as our Engineering-grade resins, it is more than tough enough for tabletop gaming miniatures, display models, and general prototyping — all with the convenience of a simple water rinse.

4. A Third Option: QTS Magic Wash Plus

What if you want the mechanical strength of standard resin, but you hate the fumes and flammability of IPA?

Enter QTS Magic Wash Plus. This is a non-flammable, nearly odorless, eco-friendly resin detergent. It boasts 5X the cleaning power of IPA and does not evaporate, meaning a single bottle lasts significantly longer. It is the perfect middle ground for professionals who need high-performance resins but want a safer, more pleasant working environment.