Is there a penalty for SCV multi repair?

Does the SCV repair scale proportionally for time and resources?

This question suggests that repair speed varies from building to building, but what about multiple SCVs repairing the same building?

Assuming I have 2 Bunkers that have 50% life and 2 SCVs to repair them. Is there a time or resources difference between:

• 1st SCV repairs 1st Bunker and 2nd SCV repairs 2nd Bunker.
• Both SCVs repair 1st Bunker then 2nd Bunker.

Using more SCV's to repair a building only increases the repair speed, the actual resources used is the same as if you had used only one SCV.

However, there is an opportunity cost in using more than one SCV for the job, because those extra SCV's would have been mining otherwise. You're basically paying those extra minerals to repair your building faster. Whether or not that's worth it is up to you.

Each worker repairs at a fixed HP/resource rate. Applying more workers to one building repairs them faster. The resources spent on the repair depend on the original price of the building and the amount of HP that needs to be restored.