Injecting epoxy or any other resin into a degraded and probably wet core does not accomplish much but a false sense of security. the deck may feel sound but what you really have is a free floating lump of epoxy that could not possible stick to wet degraded core.
If your deck is truly the structure to which your chain plates are backed then it must be made strong enough to take all the loads of your rigging..... bite the bullet and re-core.
Take a look at "Balsa = Compost
" . If your deck is plywood the condition is worse than wet balsa.
PS. The acetone thing doesn't work. I pumped acetone into one spot for 3 years and when I finally decided to do it right and open her up she was sopping wet.