[Public-List] Spar urethane over epoxy glaze

[John's Email]

Excellent, Gordon. Thank you!

Sent from my iPhone

On May 11, 2014, at 14:06, Gordon Laco <mainstay at csolve.net> wrote:

> Good day John - 
> 
> There will be no problem with bonding - but you would certainly have a
> problem with UV resistance if you are using clear polyurethane.
> 
> As I reckon you know, epoxy has virtually no resistance and will be broken
> down very quickly by UV if unprotected.
> 
> Polyurethane paint is safe to use in the sun - but clear polyurethane
> finishes are not so good (despite what some manufacturers claim - good ones
> don't claim good UV resistance)   What makes polyurethane worth using is
> it's hardness which makes it good where sandy feet etc are likely to abrade
> it like cockpit gratings and cap rails.  In order to protect it from UV,
> it's a very good idea to cover it with real varnish.
> 
> The best clear protection for epoxy is good marine varnish.
> 
> Now that I've had my rant about clear finishes - if it's paint you are
> talking about - Polyurethane is very good over epoxy.
> 
> Back I go now to varnishing SURPRISE's cap rails and hatches....
> 
> Gord #426 SURPRISE
> 
> 
> On 11/05/14 12:25 PM, "John's Email" <cooler2k at yahoo.com> wrote:
> 
>> Hello all,
>> 
>> Has anyone applied a polyurethane sealer over an epoxy glaze? Any problems
>> with bonding (such as delamination with time). What surface prep did you do?
>> Light sanding, and or acetone? I would appreciate any other tips. Thanks in
>> advance for your comments.
>> 
>> John,
>> Atalaya
>> 
>> Sent from my iPhone
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