Class C cabover lights replacement problem

[Wiz]

I'm repairing water damage to the cabover on my 2000 Coachmen Santara Class C. Water entered through the cabover lights. Behind the lights was a open area about an inch deep that was filled with "pink" insulation. I removed the lights and used a grabber tool to pull out the wet insulation. Everything is dry now. My problem is, the luane that was behind the filon came apart when it dried. Now I want to reattach new cabover lights but there is nothing for the screws that should hold them in to "catch" to. I can't figure out how to get anything in that area for a screw backing. The holes for the lights are about 1 inch in diameter, and each had a screw about one inch to each side of the light hole. A piece of wood small enough to go through the hole is too small to catch a screw without breaking. I have no access to the back side without pulling down the ceiling. Today I filled the cavity with spray in foam insulation. It's not sturdy enough to hold a screw.
Looking for ideas!
Thanks,
Paul

[IAMICHABOD]

[Grillmeister]

Ha! Time for a BEER :B

[Wiz]

I used JB KwikWood (http://www.jbweld.com/product/j-b-kwikwood-1oz/). I kneaded the putty into a ball about 3/4 inch in diameter for each screw. After letting it dry, I pre-drilled for the screws and hand-tightened them being careful not to overtighten. So far so good. Thanks for the advice all!

[Grillmeister]

but it broke the wood

I use plywood for this kind of stuff, it does not split as easy. Let us know how it works out.

[Wiz]

Grillmeister wrote:
You could push in a couple blobs of JB Stick on each side. After it hardens you can even drill and tap it.

That sounds like the solution I'm looking for. Holiday27, the wood/Gorilla glue solution was my first idea. My problem is the opening is only a inch or so in diameter and I don't have a way of holding it in place until it dries. I had tried holding it with a finger and driving a screw through it (without the light) while the glue dried but it broke the wood. It's too small and hard to maneuver to pre-drill. It's keyhole surgery.

Headed by HD after church for some JB Stick.

[IAMICHABOD]

Grillmeister wrote:
You could push in a couple blobs of JB Stick on each side. After it hardens you can even drill and tap it.

This was done with great success in a same type of application in my RV.

[Grillmeister]

You could push in a couple blobs of JB Stick on each side. After it hardens you can even drill and tap it.

[Holiday27]

How about gluing in a piece of wood with gorilla glue? My buddy just removed the lights and filled the holes with calk. Then you lose the leak point.