PaintSquare.com


The First Word in Protective & Marine Coatings

A Product of Technology Publishing / PaintSquare
JPCL | PaintSquare News | Durability + Design | Paint BidTracker

Problem Solving Forum

| More

January 31 - February 6, 2011

When SSPC-SP3 (Power Tool Cleaning) is specified, how should one decide when to apply the power tool to the entire surface and when to use it just where the coating appears to be defective or rusting?


Selected Answers

From Joe Isbell of SAWS on February 7, 2011:
1) Follow project specificatons 2) Perform adhesison testing on other surface areas that do not look bad.

From Frank Rea of GPI-Southeast on February 4, 2011:

     A coatings condition assessment should be performed before writing the specification to determine if existing coatings may remain. Use a dry film thickness gage to measure the existing coating DFT. Also, make Tooke Gage observations to determine the number of coats of paint. Overcoating becomes risky when the existing coating is very thick or there are many layers. There is a limit to the number of times you can successfully overcoat existing paint.

     Second, evaluate the adhesion of the existing coating in accordance with ASTM D 3359. Use Method A for a DFT of greater than 5 mils or Method B for a DFT less than five mils. It is not recommend to paint over existing coatings with an adhesion rating of less than 3A or 3B. A conservative approach is to not overcoat paint with a rating of less than 4A or 4B. Lastly, determine the type of generic resin in the existing coating by Infrared Spectroscopy. Some generic types of coating are more difficult to overcoat than others, i.e. they require more surface preparation.

From Lee Edelman of CW Technical Service on January 30, 2011:
You would apply the power tool to the entire surface if the recoat window had expired, in order to achieve adhesion for the coating to be applied over the cleaned surface. If the existing coating has areas that are defective, power tool cleaning can be a choice of surface prep depending on the type of failure.

Please sign in to submit your answer this question    

Tagged categories: Power tool cleaning


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

Montipower, Inc.
The MBX Bristle Blaster

Get a 2.7 to 3.3 mil profile and a Near White Metal Clean. For info visit www.mbxit.com or call 877 629-8777


Novatek Corporation
Dustless Coatings Removal

Strip it, clean it, and profile it,
all dust free! High production
rates and Blast like finishes.
Comply with new lead
standards.


Industrial Vacuum Equipment Corp.
Hurricane Vacuums
& Dust Collectors

Vacuum and dust collector hose, filters and related accessories.
IndustrialVacuum.com


Abrasives Inc.
Check our Prices for Blast Abrasives

Faced with higher abrasive costs? We invite you to call & check our rates on Black Magic® coal slag and other quality blast materials. Abrasives Inc. 800-584-7524


Polygon
POLYGON - Temporary Humidity Control

We specialize in innovative climate control solutions for industrial painting, utilizing alternative energy sources and combining desiccants with heating or cooling.


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.


Surface Prep Supply
Surface Prep Supply

Blast It! Coat It! We have you covered every step of the way. Supplier of:
• Abrasives
• Equipment
• Accessories
• Protective Coatings
888-331-7737(PREP)

 
 
 
Technology Publishing

The Technology Publishing Network

The Journal of Protective Coatings & Linings (JPCL) PaintSquare
Durability + Design Paint BidTracker JPCL Europe

 
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
 

© Copyright 2000-2014, Technology Publishing / PaintSquare, All rights reserved
2100 Wharton Street, Suite 310, Pittsburgh PA 15203-1951; Tel 1-412-431-8300; Fax 1-412-431-5428; E-mail webmaster@paintsquare.com