How to perform reverse printing on glass with wall printer?

Shirley

I recently bought a wall printer and wanted to print patterns on glass windows to expand my business. I tried printing a design on my own window glass, and it looked great at first. But not long after, exposed to wind and sun, the colors faded and weren't as vibrant as when freshly printed. I've heard that 'reverse printing on glass' can make the colors last longer. How exactly do I do that? I've been trying to figure it out for a while but haven't had any success.

Loongor

Step 1:Glass surface pretreatment

Deep cleaning

Just because the glass looks clean doesn’t mean it can be printed directly.Handprints,oil films,and dust can affect adhesion.The surface grease and dirt must be wiped off with a degreaser first.

Use a coating suitable for glass

In most UV glass projects,a dedicated coating can significantly enhance adhesion.Apply it completely evenly to avoid local build-up or missed areas.

Confirm that it is dry

If the coating is not fully air-dried,problems such as ink scattering can easily occur after printing.Be sure to wait until the surface is completely dry before starting to print.

Step 2:Software parameter Settings

The mirror output should be consistent with the Better Print logic

One of the most common mistakes is image duplication or image omission.Both mirror and reverse options must be manually checked,and neither can be missing.

Do a partial test first

Before formal printing,it is recommended to conduct small-scale tests in key areas,focusing on edge alignment and whether there are any gaps in the picture.

Step 3:Formal reverse printing process

Ink print sequence

Output the mirror color ink layer first according to the corrected parameters to ensure that the picture details and color relationships are properly positioned.

A white ink spot layer is placed behind the color ink to cover and support the base color,and also serves as a protective layer.

Control print rhythm and curing consistency

We can choose to print in one direction or in both directions.

In our glass reverse printing project,one-way printing is recommended because the mural machine does not shift left and right during the inkjet process,ensuring stable output.

Step 4😛roofing correction to full print

Local testing

Do not judge only under indoor lighting.After printing,try to go to a place with sufficient light to check the printing effect.Color cast,transparency,gimmings and edge quality all need to be noted one by one.

The number of layers of white ink coverage

Many people in project printing think that the more layers of white ink,the better.In fact,too little white ink will show through,and too much will affect the quality of the finished product.The goal of reverse printing is to balance the color,not to thicken blindly.

Lock the parameters before printing

Before printing,you need to fix the core parameters,including speed,pass,UV,power,etc.,to ensure that the project is affected by external factors.

John

Direct printing on glass exposed to sunlight will fade over time because UV rays break down most inks, even UV-cured ones. "Reverse printing on glass" means printing on the back side of the glass (the interior side), so the pattern is viewed through the glass. That way, the ink is protected from direct sun, wind, and scratches. For best results, apply UV coating liquid first, then print in reverse, and cure well. You can also use UV-resistant inks or add a protective clear coat. This method keeps colors vibrant much longer. Definitely worth trying for windows or glass doors—it's a game changer for durability!

Lucas

Thank you for your detailed explanation. It's clear that reverse printing on the back side of the glass can indeed enhance durability. However, for those who want to print on the front side, could you recommend any specific UV-resistant inks or protective clear coats that are compatible with wall printers? This would help ensure the longevity of the printed designs while printing on the front of the glass.