Paint, powder & polymer coatings · finish comparison
Clear Coating vs Primer Coating
Clear Coating (coatings for plastics) and Primer Coating (paint, powder & polymer coatings) solve the same problem by different routes; primer resists corrosion better.
Clear Coating
Coatings for plastics · $$
Clear coating is a transparent liquid topcoat used to protect color, graphics, and prepared printed-polymer surfaces while controlling gloss.
Primer Coating
Paint, powder & polymer coatings · $$ · instant quote
Primer coating is an intermediate film that promotes adhesion, seals porosity, levels minor defects, or improves corrosion protection before paint.
When to choose which
Choose Clear coat
Choose Clear coat when the substrate is already cosmetic and only transparent protection is needed.
- Protects dye, paint, decals, and printed surfaces
- Controls matte, satin, or high-gloss appearance
- Can improve cleanability and light scratch resistance
Choose Primer
Primer is the pick when its strengths below matter more than Clear coat's.
- Seals porous SLS, MJF, and filled printed surfaces
- Improves adhesion between polymer and topcoat
- Provides a uniform base color
What the numbers say
- Primer resists corrosion better.
- Primer is the lower-cost option ($$).
Scores side by side
Each score is 0–100 against every finish in this catalog. Corrosion is derived from salt-spray test duration and surface hardness from the finish layer's Vickers hardness where a measured figure exists; a finish that leaves the base metal's own surface is not rated for hardness. Cosmetic, lubricity and cost are FabDigit's engineering assessment. Scores and typical figures are screening data, not matched side-by-side tests or service-life rankings; ASTM B117 is a controlled salt-fog method, not a field-life prediction.
| Score | Clear coat | Primer |
|---|---|---|
| Corrosion resistance | 20 Low | 25 Low |
| Surface hardness / wear | 12 Minimal | — — |
| Cosmetic quality | 85 Excellent | 35 Fair |
| Lubricity | 20 Low | 10 Minimal |
| Cost | 25 $$ | 20 $$ |
Key numbers
| Property | Clear coat | Primer |
|---|---|---|
| Thickness | 15–50 µm | 15–50 µm |
| Electrical | Insulating | Insulating |
| Colours | clear | gray, white, black, beige |
| Relative cost | Standard ($$) | Standard ($$) |
| Added lead time | 3–7 working days | 2–5 working days |
| RoHS | Compliant | Compliant |
| Instant quote | On request | Yes |
Bold marks the side that is ahead on a row where more (or less, for cost and lead time) is better. Ranges are the typical specification window; the drawing call-out fixes the class.
Which materials take each finish
| Material family | Clear coat | Primer |
|---|---|---|
| Aluminum | Yes | Yes |
| Composite | With care | Yes |
| DMLS / SLM | Limited | Yes |
| MJF | With care | Yes |
| Polymer | Yes | Yes |
| SLA | Yes | Yes |
| SLS | With care | Yes |
| Steel | Yes | Yes |
| Brass | With care | With care |
| Copper Alloy | With care | With care |
| FDM | With care | With care |
| Magnesium Alloy | With care | With care |
| Stainless Steel | With care | With care |
| Titanium | With care | With care |
| Zinc Alloy | With care | With care |
Clear coat vs Primer — frequently asked
What is the difference between Clear coat and Primer?
Clear Coating (coatings for plastics) and Primer Coating (paint, powder & polymer coatings) solve the same problem by different routes; primer resists corrosion better. Primer is the lower-cost option ($$).
When should I use Clear coat instead of Primer?
Choose Clear coat when the substrate is already cosmetic and only transparent protection is needed.
Is Clear coat or Primer cheaper?
Primer is the lower-cost finish ($$ against $$ for Clear coat) among the finishes FabDigit quotes. Both are priced per part with a lot minimum; the exact figure appears on the instant quote once the part is uploaded.