This test was the second one seeking the best micro to epoxy mix when using the blue wing foam. I wanted to find out how much micro I could use in the mix, retain full maximum peel strength yet reduce weight. My second test was similar to the first but I was a lot more careful. I used 2 ply of the wing UNI glass.

All Blocks of foam were 8.2grams before layup 5” X 2.3”=11.5sq “ Blue Wing foam offcuts.
Peel force was measure by a cheap spring scale hooking under the foam and pulling consistently at an angle of about 150degrees down. Not deadly accurate but OK to give an indication. I tried to be as consistent as possible when pulling the cured glass from the foam.

I used the plans 1:1 by volume as my baseline in number1 sample. 1g of epoxy to 0.06 of micro is slightly wetter than plans but after testing is correct to use for divinycell foam. This blue wing foam is much weaker and has a very open cell structure so IMHO does not require so much epoxy in the mix and benefits greatly from having a thicker slurry. This fills the cells better and is easier to apply with less air being trapped on the surface.

You can see in the 3rd pic that all the samples came away cleanly from the foam proving its more a matter of weight and thickness, strength is not an issue. They were all sufficient. I’ll give a full report in the next entry.

10 samples

Force measurements

Samples peeled