About this video
What Is the UV Resin Coating Trick?
If your FDM prints look rough or hobbyist-grade, a thin coat of UV-curable resin can instantly make them look like injection-molded products. The technique shown in the video uses a brush-on layer of liquid resin hardened under a UV light, which fills in micro gaps between print layers and produces a glassy, reflective surface. It is one of the fastest post-processing methods in 3D printing and takes about a minute per coat, making it ideal for makers who want a premium finish without sanding for hours.
What You'll Need
- A finished 3D print in PLA, PETG, or ABS
- Brush-on or dip UV resin (also called UV varnish or UV-cure glue)
- A small UV flashlight or UV curing lamp rated 395–405 nm
- Nitrile gloves and a well-ventilated workspace
- Optional: PrintPal's custom plate generator for personalized test models and gifts
Step-by-Step Process
- Sand or wipe your print with a microfiber cloth to remove dust and loose particles.
- Apply a thin, even layer of UV resin across the surface using a soft brush.
- Move the UV light slowly over the area for 20–40 seconds until the resin hardens.
- Add a second thin coat for deeper gloss and let it cure fully under the lamp.
- Polish lightly with a clean microfiber cloth if an extra mirror finish is desired.
Pro Tips for Best Results
- Apply resin in thin coats — thick layers can yellow, crack, or stay tacky.
- Cure between layers to avoid sticky or uncured spots.
- Use a 395–405 nm UV light for fastest solidification and clearest results.
- Work in a dust-free area, since airborne particles will cure into the glossy surface.
- Seal with a clear topcoat for outdoor or high-touch parts that need extra durability.
Frequently Asked Questions
Does UV resin work on all filament types?
Yes, but PLA and PETG give the smoothest results. ABS may need a light scuff to help the resin bond properly.
Is the finished surface food-safe?
Standard UV resin is not certified food-safe. For items that contact food, apply a food-grade epoxy or sealant on top of the cured resin.
How durable is the glossy finish?
Fully cured UV resin is scratch-resistant, water-resistant, and color-stable, making it perfect for display models, cosplay props, and custom PrintPal plates.
