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Pit Avoidance Guide丨Photocuring Spray Paint Coloring Standards, Teach You How to Avoid Pits for Novices

UnionTech has summarized post-processing processes such as painting, coloring, and electroplating, so that everyone can better understand the post-processing standards of 3D printing and provide customers with standardized delivery guidelines.

Paint spraying

In the post-processing process of 3D printing, painting is one of the most common processes, usually the colour of the printed material is white, black and brown, semi-transparent, a single colour, which can not meet the user's needs for model display and hand wrenching samples. In order to meet users' needs for painting 3D printing resin materials, UnionTech has launched a new painting and coloring standard.




We currently have three levels of spray paint standard (for single-colour), the user can choose according to the use of the situation, the spray paint choice is different, the product display effect also has a difference.


Grade C: Primary painting effect

Painting standard: simple sanding of support points, and coarse layer of grain lines + colour topcoat

Elementary painting effect corresponds to C level sanding standard, which is the most elementary painting effect. After the curing of the prints, we apply a special treatment to the support points of the prints and to the areas with visible lamination lines, to ensure that they are smooth to the touch. Usually we spray the primer once and then spray the top coat to ensure that the colour can be attached to the product surface, to achieve the effect of long-term storage without paint loss.

It is often applied to traditional display models, hand-triggered appearance parts and spray-painted appearance display parts.


Grade B: Intermediate painting effect

Paint standard: spray the primer on the product first, use 320 grit sandpaper for rough sanding, remove the obvious support and layer pattern. Carry out the second touch-up paint, mainly to repair the layer pattern and sand eyes. Subsequently with 800 grit sandpaper for the second water sanding, corners, local gaps, fine layer lines to ensure the smoothness of the spray paint. Finally, the model is sprayed with topcoat, and UV paint is optionally sprayed on models that have been displayed for a long period of time for protection.

The intermediate painting effect is much more complicated compared to the low level. Basically, it is a three-time painting effect under the condition of B-level sanding. After spraying, the surface effect does not see the support points and the layer pattern. Coupled with local UV treatment, the product will not lose paint and deformation when placed for a long time and under direct light, ensuring that the product is stored for a long time.

Often used for animation hand models, high precision aerospace models, and display samples with gradient effect requirements.


Grade A: Advanced painting effect

Painting standard: spray the primer on the product first, and roughly sand it with sandpaper. Then spray the primer again, then fine sanding, so repeat 1~3 times; then spray the top coat, and finally spray UV for protection.

Advanced spray paint is basically a spray paint effect with A-grade sanding. Compared with the intermediate painting effect, the advanced painting effect is equivalent to the polishing effect. Not only is the surface smooth, but the painting effect is also uniform, and with UV protection, it can be comparable to the plating effect, and can be preserved and displayed for a long time.

It is often applied to fine equipment display models, full-transparency dip-dyeing models, fine handcraft prototypes, roadshow display models, etc.


With the upgrading of painting standards, the effect of product display will be very different, the cost will also increase, which needs to be selected according to the specific needs of users. Usually, after we inform the staff of the painting standard, there is no need to choose the sanding standard again, avoiding the situation of users paying repeatedly.



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