Re: No More Sun Bumps ( or finding the neutral zone )

Mike Dwyer <mdwyer@...>

You need the UV barrier, remember Gore says the Ozone is gone and you don't want your plane melting in the hot sun. Also the paint that peeled off mine was also black on the bottom. I don't think it was so much that the black split. I think it's the out-gassing of the fiberglass that pops the paint off and the black tries to stick to everything... I left an unprotected piece of fiberglass in the sun and after a year the resin was gone leaving only the raw glass. Seems the resin sublimates (solid to gas) in the sun?
Mike N3QP

viggenbuilder2 wrote:

Hi All,
I had dealt with all the bumps that had been there on the tail cone before Xmas, so after the cold spell began to lift back in mid Jan, I looked to get things ready to start priming. I started sanding back, and noticed some more bumps had appeared. So I picked at these and bingo, before I knew it I had stripped about 2 sq feet of paint without any adhesion at all. So with Mike D's advice ringing in my head, I decided enough was enough and set to work to strip it all off the tail cone. This is now done, and I have started to refill with epoxy filler and things are at last seemingly better. At least I can now see the substrate and know that the filler will be good.
Now the interesting part is that all the paint seemed to strip from a neutral zone (To pinch a term from Star Trek), which as it came off in sheets or strips, the paint was black on the back, but the black layer was still on the surface it had come off of. So the black layer had separated causing the lack of adherance. Looking at the paint strips, the black on the back was firmly adhered to the paint. The black layer on the tail cone was also firmly attached. So it was the black layer that had "split"! Has anybody else had this happen ? Is this relate to damp conditions?
This has caused me to wonder what to do with regard to the refinishing. I am using epoxy primer, and two pack poly top coat, which is an effective UV barrier, so do I need to reapply the black layer with the possible further problem of lack of adhesion ? Do you guys still use the black UV layer, or have you all moved on from it now ?

Richard Thomson
Tri Q G-BMFN 368 hours old.

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