REFLECTOR: smooth prime

Wed Apr 20 08:11:35 CDT 2005

After several months (years) of building we were ready to complete the sanding of the Super Fill and get it ready for smooth prime. There was an area of "brown goo" --  It had not been previously primed -- only filled with the Super Fill.    When I sanded it the first time, immediately after it had "cured", I did not notice any stickiness to it.  But after sitting for months/years, it finally started showing the brown goo.  This was in a small area only. I obviously had not mixed the Super Fill in its proper proportions.  The other 97% of the airplane has not shown any brown goo......yet.

Re: Top Gloss paint:  When I called the manufacturer to check on available colors, they also told me that they were discontinuing the water based paints.  The reason they gave me was that people were not willing to spend the time to polish their paints to get a pretty shine.

Juanita Londenberg
N4PE

KeithHallsten <KeithHallsten at quiknet.com> wrote:
Oooh - that's bad news.  I have my wings, canard and fuselage all coated in UV Smooth Prime.  On the plus side, I haven't bought any Top Gloss.  I'll have to talk to the Poly-Fiber folks.  One hopeful note is that I plan to keep my plane hangared; long-term outdoor exposure sounds like the major issue with Marc's problem.  I don't see where any "brown goo" would come from - the Smooth Prime sure seems dry and chalky when sanding!

Keith Hallsten

----- Original Message ----- 
From: Richard Riley 
To: Velocity Aircraft Owners and Builders list ; reflector at awpi.com 
Sent: Tuesday, April 19, 2005 6:28 PM
Subject: Re: REFLECTOR: smooth prime

You would be much better off to throw it out and buy a real LP primer.  

This is from Marc Zeitlin's web page - he runs the Cozy mailing list - 

http://www.cozybuilders.org/chapters/chap25.html

" Addendum: March, 2005It has been brought to my attention that I still have the "recommendation" in the above page regarding the Polyfiber products.  Having now had these products on my aircraft for 2.5 years in an outdoor environment, I strongly believe that you should AVOID these products at all cost.  The Top Gloss has been removed from the market, due (I believe, although Polyfiber won't admit it in public, but have said so to another builder) to extremely poor performance when exposed to the environment, and the Smooth Prime can, in many cases, bubble and exude brown goo underneath the finish paint, also when exposed to the environment.  It also (in my opinion) should be removed from the market.

My plane's paint is chalky, chipped, and blistered, after only 2.5 years of living outside.  The areas on the underside that are not exposed to UV are still relatively glossy. The paint on the top can be wiped off with your fingers.  Areas that live under the cover are also still glossy.  I will need to get the plane sanded down to bare micro and refinished within the next few years - what a pain in the ass."

Several builders have had Smooth Prime bubble and blister under LP top coats.  I understand Polyfiber now recommends using an LP or epoxy primer OVER the smooth prime, before paint. Given that, I don't see any reason to use smooth prime at all.

At 05:28 PM 4/19/05, gattenby at GBRonline.com wrote:
I was about to use smooth prime for the 1st time today.
I bought it several months ago...
When I opened the crosslinker stuff,  It was crumbly.
Thicker than jello / softer than a gum eraser.
But defanatly not liquid.
I tried heating it, but it won't soften up.
Acetone didn't melt it.
Does anyone know a way to make it work?
Anyway to salvage / use the filler part?

Perplexed

Noel

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