5 Steps to Evaluate Intercoat Adhesion

Posted Tuesday, May 2nd, 2017

Grey Garage-Door

When painting steel garage doors that have been installed sometime in the last two years, it’s important to remove the layer of factory-applied wax. Failure to do so will result in poor adhesion of the new paint.

To remove the wax, lightly scuff the garage door surface with a GRAY (not green) 3M synthetic steel wool pad saturated with soapy water. Rinse with clean water. Remove any loose dust or soap film. Then perform the Adhesion Test.

5 Steps to Evaluate Intercoat Adhesion – Adhesion Test

Step 1

After proper cleaning, repaint a 4”x4” area of the garage door surface. Allow the paint to dry completely.

Step 2

Use a utility knife to cut a 2” X into the 4”x4” area you repainted.

Step 3

Place a 3” strip of Scotch 610 tape over the X leaving ½” of tape free for removal. Rub the tape 10 times with heavy pressure.

Step 4

Remove the tape by pulling it at a right angle.

Step 5

Examine the tape and the door for any signs of paint removal.

If the tape removes more than 1/16” of the repaint material from the X cut, the intercoat adhesion is inadequate.