what do all ov you use to put inside your boats to keep them from sinking that the fuel will not eat up. i have a tc31. thanks.

Pool noodle is the most stuff used.

I do not recommend 1 part or 2 part expending foam, too much and you split the hull in two.
its also a pain if you want to take that foam out later.

Dan.

yup, just plain old pool noodles. the long skinny round foam things kids play with in swimming pools

Another alternative is kids floaties that you blow up and they put them on their arms. You can cut them down the seams and make long skinny floats or just leave them the way they are. We use to do that years ago before pool noodles came along.

Empty plastic soda bottles will work well too though not as versatile as others - use them under the deck though you will need to secure them to keep them from rattling around. Pool noodles are easiest and can be cut to size and shape for most locations. Secure them with glue or silicon.

Dont forget to add floatation to your hatch - they come off more than you think and you will be kicking yourself when it does (always happens the far side of the lake in the deepest water).

thanks guys. i will glue some in.

I scratch built a 1/72 scale warship quite a few years ago when there weren't many products offered for r/c boats or ships (at least not that I could find in the days before the internet).  No one had ever heard of pool noodles that long ago.

I used empty prescription bottles and empty aspirin containers as floatation.  There are lots of sizes and they can be tucked in some pretty small areas.