These are my findings/experiences using the polyurethane adhesives Gorilla glue original and Loctite PL Premium 3x for soft deck injection. There are lots of videos showing boat deck injects, I suggest looking at those as well. I used a 4" hole placement grid for this repair.

The model airplane community uses a mixture of 75% Gorilla and 25% Elmer's general purpose glue for foam wing repair which has good expansion and strength. This mixture is very effective for soft deck injection as well. I decided to use the Titebond II as it is for exterior use vs interior for Elmer's. Shooting straight glue into the deck is an unknown. The glue expands after coming into contact with water, it rained while doing the last section is why the foam had so much expansion above the deck. If the interior of your deck is dry, mine appeared to be so, there would be little expansion without the Titebond being added.

IMO forget about the PL Premium, though it is cheaper ($10 for 28oz vs $19 for 18oz) the Gorilla glue original is FAR easier to use. For this project I used 4-1/2 bottles of 18oz Gorilla, 4 tubes of 10oz PL Premium 3x, and 2-1/2 bottles of the Titebond II 16oz.

The easiest mixing and injection I found was using a 60ml catheter syringe. Remove the plunger, ensure the cap is in place, drizzle the Titebond glue on the walls of the syringe to make mixing easier, fill the appropriate amount of Gorilla glue and use a craft stick (pop-sickle stick) to mix the glues. Don't waste time as the working time is not very long, I tried keeping mixing times to roughly 15-20 seconds. Inject the mixture into the deck until it either comes out the adjacent hole or it flows from the hole you are filling after removing the syringe from the deck. Work fast so you can reuse the syringe as many times as possible (3 to 6 times for me per syringe).

The PL Premium is simply too thick to mix or inject easily. I broke 2 syringes pressing so hard on the plunger forcing PL Premium mixtures into the deck vs much less pressure being needed for the Gorilla mixture.

If I had to do it over, I would have tried Hydra Stop 300 which I believe to be what is used for injectadeck. It is a 5lb density foam according to their documentation and is under $40 for a dual canister. You still need the mixing tube and a dual caulk gun for injection plus shipping. The mixture expands more when it comes in contact with water as it is for sealing basement concrete cracks. It states to have an expansion of 20-30 times the initial volume so a little goes a long way vs the non-wet expansion of Gorilla glue mixed with Titebond being at roughly 3-5 times the volume for expansion.

Overall I am happy with the deck firmness and would do it again. I still have to chamfer the holes, fill with white marine epoxy and reattach the engine cut-out delamination areas with nuts, bolts, and washers. Gelcoating or painting the cockpit/deck will happen in the summer after it warms-up.

Alternate large area foam I have not tried:
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