rparigor(at)suffolk.lib.n
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 Posted: Sun Jul 20, 2008 3:36 pm Post subject: Serious bonding problem |
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Hi Frans
"The W18 themselves were bonded so well with the epoxy that I destroyed the W18's during the attempts to clean them. The problem is just that the underlying rib doesn't want to bond, whatever I try.
What is going on here? Any suggestions?"
Not very nice thing to happen on a plastic aeroplane indeed.
Did by chance any silicone get near your Europa?
I don't know where you are building, but did any of the following get near your aeroplane:
Furniture aerosol waxes (door opened from home to garage when spraying)
Automobile silicone spray on like Armor All (did someone clean their car tires with it near europa?)
Dot 5 brake fluid
Rain X silicone coating for automobile windshields
SiliKroil rust buster
Silicone is hard to get rid of.
Before you do anything, wipe some water on suspect bonding area, if it beads up something is on there. You need water to lay matt flat. There are some wax/silicone removers for preparing surfaces to be painted, you can try perhaps with scotchbright?? Also acetone with scotchbright. Test sample to make sure it will not damage your wing.
Something by chance is not on your sandpaper that you did your final sand with? Same question about mixing containers or brushes?
OK another thought, did you use plastic sheeting to lay up glass onto? All the Visqueen or other sheeting i have gotten a hold of for some time now has "slip" on it and can go from just a little to an aweful lot. Slip is a powered compound to prevent sheeting from sticking to itself, or in other words a release agent. I am not absolute sure if all Mfgs use the same compound but I for one wipe down all plastic sheeting with Isopropyl alcohol before I lay up onto.
Let us know what you find.
Ron Parigoris
Visit - www.EuropaOwners.org
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