Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Adhesion test and topcoating

Adhesion test and topcoating

Adhesion test and topcoating

What kindof adhesion numbers indicate a satisfactory candidate for top-coating? We have a steel tank with a 40 y.o. lead paint on the exterior that was topcoated 18 years ago with a Macropoxy 920 primer and Corothane II Urethane. The more recent topcoat is showing localized spots of lifting...we'd like to avoid (kick it down the road) the need to do a full removal of the lead coating. When doing glued-dolly tests, what range of numbers indicate an acceptable base coat? Thanks!

RE: Adhesion test and topcoating

I hope your lead paint should be an epoxy.

Since you need to really ensure the sound coating, as a coating specialist I would suggest to get at least 6MPa as the acceptance criteria.


RE: Adhesion test and topcoating

Anything that exceeds 500 PSI on the ASTM D4541 test is what you want. That's a standard for most of the High Performance Epoxies on the market: SW Macropoxy 636, Devoe 235, Gulf Coast Paint's CM-15, Rustoleum 9100.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close