The short answer to your question ("Does anybody know if there is another
option for priming with a UV protection that is not UV smooth prime ") is no
(as far as I know).
But most epoxy primer fillers have significant TiO2 content, which will
block UV. However, manufacturers will not provide any assurance that the
TiO2 is sufficient, so a formal UV barrier is needed.
I'd like to hear an edited version of your "HUGE story". I was never very
impressed with smooth prime; it doesn't fill pinholes as well as they claim.
It feels nice and smooth to the touch after sanding because of the HUGE
amount of talc that they use in it as a filler. That high talc content is
likely one of the reasons that it does not adhere well (or that the next
coat doesn't adhere well).
By the way, there are available aerospace UV-blocking (actually "filtering"
before someone corrects me) lacquers that are used as a final coat (e.g.
Sikkens CTR100, which is a sister product of the paint system that Europa
recommend). This is supposed to provide UV protection. However, I note that
in my case trim colours have faded under this stuff; so that's not all its
cracked-up to be either.
Does anyone know whether mica absorbs UV? Mica was the basis of the early
Polyfiber Smooth Shield, but a paint chemist at PPG told me that mica does
not block UV
Duncan McF.
----- Original Message -----
From: "Dave Anderson" <dja767@charter.net>
Subject: Europa-List: Repainting the mini U2
>
> Hello group.
>
> As a result of finish coat failure (a HUGE, long story), I am starting to
experiment with removing my paint and repainting the airplane. I have UV
smooth prime underneath for the UV protection and after today's trial
sanding it is clear the paint will come off fine, but I will not be able to
avoid doing the entire job over again. I can't leave the primer underneath
and get thte finish coat off. I will attempt to remove the finish coat from
the primer on certain areas, but I am facing repeating history. The plan now
is to go with two possible choices. One is aerothane with an epoxy primer.
Unfortunately the epoxy primer doesn't have UV protection ( what the heck is
that anyway, really!). I have a local painter who has said he does not like
the water based UV smooth prime - he does not use if and has painted
airplanes that have been primed with it.
>
> Here is the question: Does anybody know if there is another option for
priming with a UV protection that is not UV smooth prime ( seems everyone
uses that stuff)? Also, since it has been over a year since I painted and I
have a gallon left over, does anybody know what the shelf life of that stuff
is? I have purchased a quart and am going to experiment with different items
to paint to see if i can get a smooth finish.
>
> I just can't wait to get more painting experience! This time, it will
work!
>
> Dave
> A227
> Mini U2
> 178 hours TT
> working on cabin heater, upholstery and REPAINT!
>
>
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