Re: [foldingboats] EPDM rubber coating on fabric?

[FoldingBoats]

MICHAEL SILVIUS: ... EPDM rubber coating ... Inland Marine ... designed for re-coating 
inflatables ... I have only heard of EPDM in regards to industrial roofing 
applications. My immediate idea was making my kayak covering out of fabric and then 
coating it with this stuff. 

Ralph Hoehn: I have in my basement the remains of a can of rubber roofing under coat 
awaiting trials of application to boat building fabrics. The singel significant 
difference between under coat and finish coat is the fact that the former is not 
guaranteed to be UV degradation resistant. My main concern, and the one I intend to 
put to the test, is abrasion resistance.

MS: They claim it leaves a 5 to 7 mill coating, and can be thined for build up 
purposes with comon solvents. It does not apear to be to costly. 

RH: I suspect, that building up successive layers might not be the best practice only 
because it is hard under basement conditions to ensure their proper bonding to one 
another. Peter Chopelas gave his "Brief Case Baidarka" a single unthinned coat of 
Hypalon (fancy, connotation laden name, but really only another synthetic rubber), 
which appears quite sufficiently abrasion resistant and sticks to the fabric just fine 
-- WITHOUT penetrating it, which might cause it to stick to the frame of the boat!!

MS: inflatablefix.com
RH: Thanks, Michael! One for the files!! If anyone gets a chance, please try it on 
some sample fabric, test it for adhesion and abrasion resistance AND its ability to 
dry / cure sufficiently not to turn a folded skin into a sticky ball and let us know.

Best regards,
Ralph

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