Very interesting Colin. Can I ask a few questions please.
As you know I have over 400 windows (portholes) on my Titanic hull and wish to fill them with something that's clear and watertight.
To this end I was advised to try the window making product called 'Humbrol clear fix'. I have spent two days running this tacky stuff into the holes and now found out it's not waterproof. I then spent two more days cleaning it all out and sanding smooth the hull. This required a respray to restore the finish and a re drill of the portholes to clean them out.
I was now planning to go the epoxy route but your suggestion above has got my interest. Would you say that your 'find' is suitable product for filling 3mm hole with a hypodermic needle with enough working time so that the needle doesn't get blocked. ? As it would if using two part epoxy.
I enclose a picture of the result before removing it all.
Help please as I'm desperate ...............
ken