Adding expanding foam inside hull??

[6sHyper]

Hi guys i have a Motley Crew that i have only ran twice, its in mint condition still, i have a T180 and a 3674 1900kv feigao 9xl copy in it and it runs pretty quick, I have a 4074 leo 2000kv in the mail and i expect it to run mid 50s on 5s. I have seen a few posts about adding expanding foam in the front of the hull?? Can someone please enlighten me on the type of product i should be using to do this as to not bulge the hull? Also i would really prefer to just drill a hole or 2 inside that way i could use a rubber plug to cover it rather than glassing and painting. any suggestions/recomendations?

a product i could pick up at home depot would be ideal as we have one nearby.

Thanks

[srislash]

Is there a Industrial Plastics there?They would carry the two-part closed cell foam.I have noticed some sray cans with blue foam on the job sites lately.They should be closed cell and probably available at Home Depot or a construction supplier.

[6sHyper]

ya we have an industrial plastics, so closed cell expanding foam is what i'm after?

[srislash]

Apparently the Great Stuff is open cell and will absorb moisture.So yes closed cell is what to ask for.I've been kicking the idea around myself for my boats.

[Chilli]

Here is the good stuff.

http://www.uscomposites.com/foam.html

[slapahondn]

Make sure you get the 2 pound foam the 4 lb will make your boat too heavy.

[egneg]

I have used great stuff for window/door jams - just add it a bit at a time.

[slapahondn]

I have used great stuff for window/door jams - just add it a bit at a time.The problem with great stuff foam is that it's an open cell foam and will absorb water over time. The 2 part foam is closed cell and is impervious to water.