PaintSquare.com
Follow us on Twitter Follow us on LinkedIn Like us on Facebook Follow us on Instagram Visit the TPC Store
Search the site

 

Advertisement

Sherwin-Williams


Problem Solving Forum

| More

April 30 - May 6, 2012

How do you determine whether a lead-bearing coating can be overcoated or removed and replaced?

More items for Coating Materials


Selected Answers

From Frank Rea of GPI - Greenman Pedersen, Inc. on May 1, 2012:

     To determine whether any coating can be overcoated or needs to be removed and replaced, one must first conduct an existing coatings condition assessment. The assessment consists of observations and tests which provide the data necessary to make the decision. A typical condition assessment begins with observing the type, amount, and distribution of rust and coatings defects. SSPC-Vis 2 is a helpful guide when making this determination. Typically, if the amount of rust exceeds 25% or is destributed randomly over several locations, full removal is likely because spot cleaning would be too labor-intensive and time-consuming.   

   Second, dry film thickness and number of coats should be measured with a magnetic DFT gage and a Tooke gage at random and representative locatons. There are only so many layers and a maximum total thickness that can be applied before risking failure. Next, utilizing ASTM D 3359 Methods A (DFT > 5 mils) or B (DFT < 5 mils), determine the adhesion rating. When overcoating, the new paint may shrink as it cures and put stress on the existing coating. If the existing coating is not tightly adhered, it may peel. Lastly, take sample of the paint and have the top coat analyzed by Fourier Transform Infrared Spectroscopy (FTIR) to verify the generic type of resin. This will allow the specifier to select a compatible overcoat material.

Please sign in to submit your answer this question    

Tagged categories: Lead; Overcoating lead


Current PSF Question | Submit a PSF Question | Full PSF Archive

Advertisements
 
Jotun Paints Inc.
 
Jotun Jotachar 1709
 
Mesh-free passive fire protection epoxy designed to protect against hydrocarbon pool fire scenarios for up to four hours as defined in the ANSI/UL1709 standard.
 

 
Carboline Company
 
New product: Carbozinc® 608 HB
 
Introducing a new high build zinc-rich primer that can save you time and money by eliminating the epoxy intermediate coat!
 

 
SABRE Autonomous Solutions
 
Safety
 
Removing blasting operators from harmful environments is our key objective.
 

 
Industrial Vacuum Equipment Corp.
 
Hurricane Vacuums
& Dust Collectors
 
Vacuum and dust collector hose, filters and related accessories.
IndustrialVacuum.com
 

 
Mitsubishi Gas Chemical America
 
Performance Amine 1,3-BAC
 
A highly reactive cycloaliphatic diamine offering superior performance. Reasonable cost and curing efficacy makes it suitable for all types of epoxy resin applications.
 

 
KTA-Tator, Inc. - Corporate Office
 
KTA-Tator Training Course Opportunities
 
• IACET Authorized Continuing Education Unit (CEU) Provider
• Live Basic Coatings Inspection Courses
• Customized/Private Courses
• Online/self-paced curriculums
Contact: Tiffany Kelly at 412-788-1300 x217
 

 
CHLOR*RID International Inc.
 
SOLUTIONS THAT WORK
 
Companies that invest in corrosion control use CHLOR RID products
  • Soluble salt removal liquid
  • Test kits to verify contamination levels
  • Surface passivation to hold the blast
INFO@CHLOR-RID.COM 800.422.3217
 

 
Blastox/The TDJ Group, Inc.
 
Blastox® - One Step Lead Abatement
 
Sandblast additive delivered to jobsite pre-blended to eliminate hazardous abrasive wastes. Why mix, meter or apply at the job-site? Blast with ease and
Let your painters paint!
1(800)-252-7869
 

 
ABKaelin, LLC
 
ABKAELIN EH&S SERVICES
 
Programs/Training/Monitoring for Silica, Lead, Noise, Beryllium, Hexavalent Chromium, Cadmium, Hazardous Waste*PM10 & TSP-Lead Ambient Air Monitoring*SSPC C3/C5
 

 
DeFelsko Corporation
 
PosiTector SST Soluble Salt Tester
 
Measures the concentration of soluble salts on metal surfaces. Use with all Bresle patch types including the reusable, adhesive-free PosiPatch.
 

 
 
 

Technology Publishing Co., 1501 Reedsdale Street, Suite 2008, Pittsburgh, PA 15233

TEL 1-412-431-8300  • FAX  1-412-431-5428  •  EMAIL webmaster@paintsquare.com


The Technology Publishing Network

Durability + Design PaintSquare the Journal of Protective Coatings & Linings Paint BidTracker

 
EXPLORE:      JPCL   |   PaintSquare News   |   Interact   |   Buying Guides   |   Webinars   |   Resources   |   Classifieds
REGISTER AND SUBSCRIBE:      Free PaintSquare Registration   |   Subscribe to JPCL   |   Subscribe to PaintSquare News
MORE:      About PaintSquare.com   |   Privacy policy   |   Terms & conditions   |   Site Map   |   Search   |   Contact Us