TABLE IV 

 Ratings for Coatings Immersed in Seawater 



Number of Co8ts and 

 Coating Description 



Coating _ 

 Thickness _ 

 (mils ) Unscrilped 



3 Years 



Service Rating 



6 Years 



Scrited Unscrited Scrited 



Phosphoric acid 

 pretreatment 



1. Coal-Tar Primer 



2, Coal-Tar Enamel 

 30i+. Natural Resin A-F+ 



-100 



10 



10 



Phosphoric acid 

 pretreatment 



1. Coal-Tar Primer 



2. Coal-Tar Enamel 

 3-h. Natural Resin A-F* 



70-85 



10 



10 



Phosphoric acid 



pretreatment 

 1. Synthetic Rubber 



(Neoprene) 

 2-13. Synthetic Rubber 



(Neoprene) ^0-55 10 



Phosphoric acid 



pretreatment 

 1-2. Alkyd Primer 

 3. Hot Plastic A-F Ul 10 



Phosphoric acid 

 pretreatment 



1. Coal-Tar Primer 



2. Coal-Tar Enamel 



3. Hot Plastic A-F 85-115 10 



10 



10 



10 



Wash Primer Pretreatment 



1-3. Vinyl Primer T 



i+-5. Vinyl A-F t 8.5 



Wash Primer Pretreatment 



1-2. Vinyl Primer t 



3-8. Vinyl A-F t l8 



10 



10 



10 



10 



Phosphoric acid 



pretreatment 

 1-2. Vinyl Primer 

 3-10. Vinyl Enamel 



18-27 



10 



*Experimental NRL formula 



** See Table VI for rating system details 



+ Navy cold plastic A-F paint, 

 t Similar competitive systems 



From Alexander, et al (1958) 



A-9 



