PaintSquare.com
      | Connect Follow us on Twitter Like us on Facebook
About | Subscribe | Advertise
  

 

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 Independant 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

SSPC: The Society for Protective Coatings
http://www.sspc.org/

Join SSPC and Enhance
Your Career !


Graco Inc.
Graco Mortar Pump

The M680 sprays epoxy-based mortars, anti-skid coatings, cementitious and filled materials. Compact.
Easy to use.
Call 877-844-7226 or toughtek@graco.com


Nationwide Overspray
Profession Overspray Removal Services

The Finest Name in Safe Overspray Removal. We specialize in removing all contaminants from any surface. Family Owned and Operated for 33 years! Fully insured. Satisfaction is guaranteed.


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.


Farrow System USA, Inc.
       SIMPLY the BEST
In Wet Abrasive Blasting

Automated controls simplify operation. 100lb. media capacity & enclosed water tank, for hours of continuous blasting. Dry weight of 350 lbs. & 150 psi capable.


PPG Protective and Marine Coatings Group
Industrial strength performance in ONE can.

Now get the durability and protection of two components in one can: Amercoat® ONE, PSX® ONE and Sigmadur ONE.


U.S. Zinc
Service. Better With U.S.

From custom-blend zinc dust products to technical support, logistics and environmental compliance, we are there for you.


Sidewinder/Persyst Enterprises, Inc.
The Sidewinder Model M2 Solvent Recycler

Combat the rising cost of gunwash, thinners, acetone & more while drastically reducing waste disposal coat.


Polyval Coatings
Polyflex® Polyurea Linings

Polyflex™ new Polyurea Geotextile Membrane System has been specifically engineered to protect the environment in containment applications.
www.polyflexlinings.com

 
 
 
Technology Publishing

The Technology Publishing Network

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

© Copyright 2000-2015, 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