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post #19 of Old 10-24-2017
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Re: Large Blister on Oday 31 Rudder

Guess what they use to clean up Polyurethane guns .......
Produced by:
Professional and Specialized Services
in consultation with the Construction
Health and Safety Program,
Ministry of Labour
Alert #C11/0196
ISSN 1195-5228



Polyurethane foam is being used more and more as an insulation
material in residential construction. Recent experience
indicates that some contractors may not be providing workers who
handle it with adequate respiratory protection or training in
proper work and hygiene practices.

Polyurethane foam is usually prepared on site in a closed system.
The following materials are mixed in a 1:1 ratio:

- base resin, comprising polyols, amines (often tertiary
amines) to act as catalyst and plasticizers; and

- isocyanate (both monomeric and polymeric), usually
methylene bisphenyl isocyanate (MDI).

Normally, two workers are involved in spraying the foam: a
sprayer and a helper who cuts off excess foam and cleans it up.

To clean the spray gun, the workers use an organic solvent such
as glycol ether (ethylene glycol monoethyl ether).

The hysterical laughter you hear as you drive a way in your"new" boat ..... is the seller.
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