LOCTITE^® EA 3478

How to use

1. Preparation - Cleaning

Remove dirt, oil, grease, etc. with a suitable cleaner, e.g. high pressure water cleaning system using LOCTITE^® SF 7840 (LOCTITE^® Natural Blue^® cleaner/degreaser).


2. Preparation - Grinding

Blast all surfaces to be coated with a sharp edged angular grit to a depth of profile of 75 to 100 microns and a degree of cleanliness of Near White Metal (SIS SA 2½ /SSPC-SP 10).


3. Preparation - Cleaning

After blasting, metal surfaces should be cleaned with waterless cleaner, e.g. with LOCTITE^® SF 7611 (LOCTITE^® Pro Strength Parts Cleaner), and be coated before any oxidation or contamination takes place.


4. Preparation - only for metal exposed to salt

Metal that has been in contact with salt solutions, e.g. seawater, should be grit blasted, high-pressure water blasted,and left for 24 hours to allow any salts in the metal to sweat tothe surface. A test for chloride contamination should beperformed. The procedure should be repeated until chlorideconcentration on the surface is below 40 ppm.


5. Preparation - Mixing Ratio

Mix 4 part resin to 1 part hardener by volume (7.25 to 1 by weight) or transfer entire kit onto a clean and dry mixing surface and mix thoroughly until color is consistent.


6. Application

Apply fully mixed material to prepared surface. If using to rebuild shaft, the following applies: Machine the worn area down 3mm (0.125 in) to produce a square shoulder on part. The material is stronger with a square edge versus a feathered edge. Machine a spiral cut in bottom of area to be repaired to provide mechanical keying into surface. Apply excess product to ensure small shrinkage during cure does not produce depression. Machine the surface to original dimensions prior to full cure, as the product is very wear resistant.


Inspection

Visually inspect for pinholes and misses just after application. Once the coating has cured, repeat visual inspection to confirm it is free from pinholes, misses and mechanical damages. Control thickness of the coating, especially in the critical points. Perform a test with a holiday detector to confirm coating continuity.