Rod Box Repair

[pk]

I am in the process of a rehab on my rod boxes. So far I have stripped out the hardware & refinished it with Cetol Light. As for the boxes themselves, I have sanded with 180 & washed them down. Next step is to repair the cracks around the flanges and paint them.
Questions:
I checked the archives and read about using glass tape as a backer & then filling the cracks. Where do you get glass tape?
My plan is to add a wood strip to the backside of the gunnel cut-out for support as mentioned in the previous posts. What do you think about mounting the boxes with 4200 as opposed to screws? Seems like that coupled with the screws from the teak surround should keep everything secure & minmize holes in the flanges.
Thanks for any feedback in advance.