Your Questions About Mix Designs Answered

Q. Why should I use sand in my mix? 
A. Sand is used for traction, skid resistance and also to provide a uniform texture to the surface. 

Q. Can you explain sieve size, % retained, % passing, etc.? 
A. Sand or the other aggregates added to a sealer must fall within a range of particle sizes, neither too coarse nor too fine. This is ascertained by the sieve analysis, which means that sand has been sifted through a set of screens with varying mesh sizes (openings in the screen). Percent retained means how much of 100 grams of sand was retained on the screen and % passing is how much passed through the screen. Use your manufacturers recommended grades.  

Q. Why use additives in sealcoatings? 
A. The use of latex additives is very common. There are many latex additives to impart all types of performance advantages. For example, rubberizing additives improve flexibility, durability, toughness, etc; faster drying additives help sealers dry fast; and thickening additives build the viscosity of sealcoatings diluted with large amounts of water. 

Q. How much water can I use? 
A. Follow the manufacturer's recommendation. Normally 25-30 gallons/100 gallons of concentrated sealer is recommended. Higher percentages are recommended for mix designs that use additives and larger amounts of sand. 

Q. What will happen if I use different additives (from different suppliers) in the same tank? Why did the viscosity go haywire? 
A. The viscosity may go haywire and the sealer may be totally ruined (de-stabilized-gelling). Do not mix additives from various suppliers and always adhere to the manufacturer’s recommendations. Also the manufacturer’s warranty may be void if you use other additives.

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