Low Shrinkage Epoxy for plug

[berridos]

Hi Everybody

I recently covered my EPS wing plug with fiberglass. I wanted to make the plug stiff and finishable. Therefor I had to wet laminate one side first and when dry, the other side.
To my surprised after the first layup the wing took a slight banana shape because of the resin shrinkage. With the laminate on the underside I could almost correct this effect.
I need to repeat now the procedure with the horizontal stabilizer (4m long) and would love to avoid having a sleepless night because of shrinkage.
Could someone recommend a wet layup epoxy that cures at room temperature and that stands out because of low shrinkage?

Thanks.

[wyowindworks]

You need to laminate both sides in one session rather than two. You also want to do each side with at least at least two layers of reinforcement. One layer on 0/90 and one on +/-45. The layup of each side should mirror each other.

Adam
Who’s seen lots of warped wings

[berridos]

Easier said than done. Doing both sides on the same lay up is not possible

[wyowindworks]

Why do you deem it not possible? What problems do you foresee?

I have made many wings, large (32’) and small (4’), in one curing session.

[berridos]

The plug is very thin out of EPS without reinforcements. Handling it and turning it over to change the side to position it on the jig with the wet laminate on it would be risky. However could be done. On the other side if I laminate one side, put peelply on it and turn it over upside down how you keep the cloth from falling off if i cannot put tape around it because i need to laminate the other side?
I use four layers on each side 160gm.
Does epoxy glass filler with microballons also shrink? I could reinforce the plug preclothed filling out the pores and uneven zones before glassing the plug.
Any commets appreciated.

[wyowindworks]

Do you have the shucks/beds that the cores were cut from? Were the cores hot-wire cut?

[berridos]

This is the setup and bed i am using. Overlapping four layers at the leading edge would distort the the bed form. Do you think that if I place the seam on the upper side maybe one inch back would produce shrinkage?