What is a two coat seal?
A two-coat seal is an aggregate laying technique that uses two coats of bitumen and two layers of sealing aggregate. The first aggregate uses large-sized aggregate with bitumen followed by a secondary coat of bitumen and a secondary layer of smaller aggregate sealed over.
The interlocking combination of a two-coat seal allows for a longer-lasting surface. By allowing interlock between larger and smaller aggregate, the surface is more resistant to stripping.
A two-coat seal starts with a large base and a prime seal. The first binder application goes in, with the first, larger aggregate coming after. The second binder goes on top together with the second, smaller aggregate to create a 2 coat bitumen seal.
Done properly you will get a strong long lasting surface
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