Recommended Mixing Ratio for 3D Finish Resin

Why a 100:50 ratio by weight matters

The 3D Finish system is formulated around a 2:1 resin-to-hardener ratio by weight. Using 100 parts of resin to 50 parts of hardener ensures the chemical reaction completes properly, giving the coating enough hardness, adhesion and clarity for PLA, ABS and LAYWOOD prints. Measuring by weight rather than volume is important because the two components can have different densities.

For a stronger result on detailed 3D printed pieces, you can use the 3D Finish Fast Coating Epoxy Resin for 3D Prints with a calibrated digital scale.

Mixing and compatibility checks

Accurate weighing is only part of the process. After combining the two components, stir the mixture thoroughly for around two minutes, scraping the sides and base of the container so no unmixed resin remains. A poorly combined batch can leave soft or tacky areas even when the overall ratio is correct.

• Weigh the resin and hardener into a clean mixing cup.
• Combine the parts and stir to bring both components together.
• Mix for approximately two minutes and scrape the container edges.
• Run a small test on a scrap piece or an inconspicuous area before coating the full print.

When this matters

This ratio matters most when a visible, handled or dimensional part needs a reliable cure. If the mixture is off, the coating may remain soft in places or fail to build the expected surface quality. For a 3D printed motorcycle floor poster, that can be noticeable in the final gloss or edge definition.

A small test batch on the actual material is a sensible step before committing to a full coat, especially if you are working with a new filament or a mixed media layout.