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16

available in one-component packaging, do not

require priming, and are paintable.

Do not use butyls for high-movement, water-

immersed or traffic joints.

Latex:

Acrylic emulsions or polyvinyl acetate

derivatives.

These are typically used for interior applications

when a fast cure time is desired for painting.

They can be coated sometimes in less than one

hour. These materials have very low movement

capability, high shrinkage rates and only fair

adhesion properties.

Latex materials should not be used for any

exterior application.

Polysulfides:

Produced from synthetic polymers of polysulfide

rubbers.

They are manufactured in one and two-

component packaging with a wide range of

colors.

Polysulfides are acceptable for a wide range of

applications. They require primers on all

substrates and the required primers vary from

substrate to substrate.

Polysulfides have been replaced by urethanes

and silicones, which have better recovery ability

and joint movement capability.

Polysulfides should not be used for joints that

have bituminous residue or contamination,

unless such residue can be completely

removed. (This is very difficult to achieve.)

They should not be used for joints of

substrates containing asphalt or oil-based

products.