Welds and Castings Porosities Sealing
Porosity Sealing Application Method A-105

This method pertains to the application of SAF-T-LOK S90 Penetrating Sealant Compound for the sealing of existing welds porosities and castings.

PROCEDURE

1. IMPORTANT: TAKE PROPER SAFETY PRECAUTIONS IF WORKING WITH FLAMMABLE LIQUID TANKS. AVOID USE WITH COMPRESSED GASES.
   
   
2. Wire brush to remove paint, rust, etc. from repair area.
    
3. Clean repair area with a cleaner/degreaser.
    
4. Apply localized heat to bring repair area to approximately 200ºF
    
5. Allow repair area to cool to approximately 120ºF
    
6. Brush or spray S90 Penetrating Sealant Compound on repair area.
   
   Note: *Steel / Aluminum/ Stainless - Use SAF-T-LOK S90 Penetrating Sealant @ 120ºF.
   Note: *Not recommended for “blowholes”.
   *Maximum porosity sealed - .005”.
    
7. Allow to cure for 30 minutes (High pressure above 150 psi – 1Hour).
    
8. Clean with SAF-T-LOK Cleaner & Degreaser to remove excess sealant. Do not grind.
    
9. Paint as required.
   
   Note: Casting repair uses same procedure.
   
   SEALING NEW WELDS – PREVENTATIVE MAINTENANCE
   1. Remove all slag and scale while hot.
   2. Apply S90 Penetrating Sealant Compound when weld is 120ºF and falling.
   3. Follow the procedure above.