Not sure if this has been posted and hope isn’t against forum rules. But I was searching for float material for my OK-60. For this place that sells things for old cars and such. They sell the black foam float material in bulk. The say it can be machined down and not needed to be resealed. Sounds good to me. I will let you all know how it goes, mat’l is on order. Well here is the site: https://restorationstuff.com/
I’ve bought a lot of things from them over the years.A very good company to deal with and small enough that you can call them with questions or to order.