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Fred Klein
Joined: 26 Mar 2012
Posts: 503
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 Posted: Fri Jul 12, 2013 4:36 pm Post subject: UV primer(s) |
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I've been using the Stits / Poly Fiber products for filling and priming, namely the SuperFil and the SmoothPrime "pinhole killer", and the EP-420 primer/sealer...have just missed making a serious mistake...and thought it was worth my time to share my experience.
I've found all the products very easy to work with and satisfying to bring to the desired level of smoothness...particularly the hi-build SmoothPrime, using a 3 foot sanding board starting at 220 grit before going up to 320 paper. I've been particularly prideful for doing my entire airframe w/ only 2 gallons.
And that hi-build SmoothPirme is REALLY heavy stuff...so w/ weight always a concern, i was pretty aggressive with the sanding as I strove to first, achieve as straight and true a (wing) surface as I could, and second, to make sure that as much as possible of the weight of all that SmoothPrime ended up in the canister of the shop vac. It certainly didn't bother me that my wing surfaces, as smooth and true as they may be, got pretty blotchy w/ ALL the SmoothPrime removed in some areas where great areas of blue SuperFil became visable. It didn't bother me because I knew I would be applying the white EP-420 epoxy primer on top...and all of this time, I believed that the EP-420 would provide the necessary UV protection. WRONG !!
The EP-420, 2 part epoxy primer DOES NOT provide any UV protection...I had misread or misremembered...and only learned by chance during a conversation on a related matter w/ a Stits tech person.
So with that Stits product line, it is the SmoothPrime which provides the UV protection...not the EP-420 primer/sealer! And I'll be working on a 3rd gallon...rolling on 3 coats...sanding it smooth down to 400 grit...but stopping while I still have a white airplane...before applying the EP-420 primer/sealer.
Fred
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bill mcclellan
Joined: 28 Jan 2010
Posts: 43
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| Posted: Fri Jul 12, 2013 4:51 pm Post subject: UV primer(s) |
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Fred, a suggestion, if you can spray on the Smooth Prime, it will be a lot more consistent and as you know after rolling it on, there is lots more sanding after rolling than if you can spray it on. Also, John Lawton gave me a paint to use that is UV protective, albeit very expensive paint, $500 + a gallon and two qts hardener (and illegal in Calif).
Bill McClellan
--
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Fred Klein
Joined: 26 Mar 2012
Posts: 503
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| Posted: Fri Jul 12, 2013 5:30 pm Post subject: UV primer(s) |
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On Jul 12, 2013, at 5:51 PM, William McClellan wrote:
| Quote: | uta suggestion, if you can spray on the Smooth Prime, it will be a lot more consistent and as you know after rolling it on, there is lots more sanding after rolling than if you can spray it on. Also, John Lawton gave me a paint to use that is UV protective, albeit very expensive paint, $500 + a gallon and two qts hardener (and illegal in Calif).
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Hey Bill...how'ya doin?
Re: spraying SmoothPrime...for the life of me, I can't imagine the high viscosity SmoothPrime flowing thru a spray gun.
I have VERY minimal experience spray painting, so my comfort level at trying to spray Smoothprime is very low. Have you thinned the stuff?...with what?
I'm very comfortable rolling it but that's just playing to my fears. Up til now, I haven't minded the extra sanding since it cuts so nicely...of course, I am planning to spray the EP-420 sealer/primer.
Fred
[quote][b]
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Fred Klein
Joined: 26 Mar 2012
Posts: 503
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| Posted: Fri Jul 12, 2013 5:35 pm Post subject: UV primer(s) |
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On Jul 12, 2013, at 5:51 PM, William McClellan wrote:
| Quote: | | John Lawton gave me a paint to use that is UV protective, albeit very expensive paint, $500 + a gallon and two qts hardener (and illegal in Calif). |
Bill...what would be the brand of that paint?...if you don't mind letting the NSA know as well...
Is that a top coat?
Will you / have you still use(d) a sealer for the SmoothPrime?
Fred
[quote][b]
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christoph.both(at)acadiau
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| Posted: Sat Jul 13, 2013 4:41 am Post subject: UV primer(s) |
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Smooth Prime rolls on very easy, you can control thickness with the proper roller. I did 3 coats as a minimum. Sands easy with 12 to 18 inch foam sanding block DURABLOCK. Rolling allows better working the stuff into pin holes. Then sprayed epoxy primer filler, sanded to 350. Then another thin epoxy surface prep, hand sanded to 500. Then BASF single stage polyurethane low volatility paint (still legal in Canada), two full coats. Easy to maintain and fix.
Christoph Both
223 Classic Wings.
Wolfville, Canada
Sent from my iPhone
On 2013-07-12, at 22:30, "Fred Klein" <fklein(at)orcasonline.com (fklein(at)orcasonline.com)> wrote:
[quote]
On Jul 12, 2013, at 5:51 PM, William McClellan wrote:
| Quote: | uta suggestion, if you can spray on the Smooth Prime, it will be a lot more consistent and as you know after rolling it on, there is lots more sanding after rolling than if you can spray it on. Also, John Lawton gave me a paint to use that is UV protective, albeit very expensive paint, $500 + a gallon and two qts hardener (and illegal in Calif).
|
Hey Bill...how'ya doin?
Re: spraying SmoothPrime...for the life of me, I can't imagine the high viscosity SmoothPrime flowing thru a spray gun.
I have VERY minimal experience spray painting, so my comfort level at trying to spray Smoothprime is very low. Have you thinned the stuff?...with what?
I'm very comfortable rolling it but that's just playing to my fears. Up til now, I haven't minded the extra sanding since it cuts so nicely...of course, I am planning to spray the EP-420 sealer/primer.
Fred
[b]
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craigb(at)onthenet.com.au
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| Posted: Sun Jul 14, 2013 2:55 am Post subject: UV primer(s) |
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As primitive as it sounds, if you want to spray “thick” liquids I suggest you try an electric airless gun
They are quite cheap give an ok finish for priming, and will spray stuff like rubber latex and spray putty
With no problems, sure they are a bit noisy but could be a good compromise over the roller.
Regards
craig
[quote][b]
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