"The font looks blocky or pixelated." Solution: You downloaded a low-quality clone. Go back to DaFont and download the official "Stark Industries" by Aaron P. Ensure you are using it at a large point size (72pt+).
The actual name and logo are trademarks of Marvel/Disney . You cannot use a free fan font to sell “Stark Industries” merchandise or imply endorsement. However, you can use these typefaces to make:
You can download Steelfish for (non-commercial) from various font repositories like DaFont or Larabie’s own site. This is perfect if you are making a fan poster, a T-shirt for yourself, or just learning typography.