what lb foam filler?

shiner1836

shiner1836

Location
Texas
so what is the best foam filler? ive seen that some guys are unhappy about some of the uscomposites stuff. what lb do yall recommend as well?
 
shiner1836

shiner1836

Location
Texas
tried that stuff last week, didnt turn out well at all, im flatdecking my 650sx, not to mention that it wont sand down worth a damn......
 
K

Kennay

Squarenose for the _____
Location
Myrtle Beach, SC
I don't think there is anything wrong with the US foam. I think some people aren't competent enough to mix it correctly. For proof, just find the people complaining, and look at their builds.

No offense to them.
 
Cannibal

Cannibal

Tasty Human
Location
Summit Lake, WA
Originally Posted by Kennay
I don't think there is anything wrong with the US foam. I think some people aren't competent enough to mix it correctly. For proof, just find the people complaining, and look at their builds.

No offense to them.
Click to expand...

I have not used the US stuff, but I'm about to order some. I know the stuff I have (Tap Plastics), you need to mix very well for a very thorough mixture. I also heat the garage up to 80* when it's really cold, other wise, just preheat the hole I'm pouring the foam, preheat each part of the foam to 80*, then when I pour it, I use a heat gun and heat the foam while it's expanding.

And ya, I stay way from foam in a can. That stuff requires air to dry, so it's really bad to use behind foot holds or anything. Also it takes forever to actually harden enough to sand and form. 2 part stuff reacts and hardens by chemical reaction.

I use 2lb foam for everything. You will find if you are using it as a form, it will have some air pockets you might have to fill when using it before glassing over. It's not quite as strong as 4lb which some one here will recommend. So for under the tray, you will want to make sure the tray glass itself is strong enough to support you without relying on the foam for support. The 2lb does add some support though. As a bonus, with the 2lb foam, you are basically getting double the quantity of foam for the same price as the 4lb.
 
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ski4

ski4

gonzo
Location
cleveland
used 4 lbs us composites foam
for my size i didn't feel good using 3 lb.

it has a lot more support than the stock stuff for sure
 
R

ridethelip

Guest
u.s. composites supplied this info.

[SIZE=-1][SIZE=-2]2LB density marine foam is recommended for void filling in nonstructural applications.
[/SIZE][/SIZE][SIZE=-1][SIZE=-2]4lb foam is recommended to be used when supporting gas tanks and some deck areas.
[/SIZE][/SIZE][SIZE=-1][SIZE=-2]Your fingernail can penetrate its skin, however it cannot be dented by hand.[/SIZE][/SIZE]
[SIZE=-1][SIZE=-2]8LB density foam is extremely hard and rigid, like that of a soft wood.
[/SIZE][/SIZE][SIZE=-1][SIZE=-2]extremely durable and rigid foam is needed for support.
[/SIZE][/SIZE][SIZE=-1][SIZE=-2]16LB density foam is essentially as hard as a rock, you would need a hammer in order to make any dents in this product. [/SIZE][/SIZE]
[SIZE=-1][SIZE=-2]I used the 4lb with success thats holding up great underneath the tray and around exhaust.
If you have not used it before suggest you use a small cardboard box with 2 holes in it.Mix a small batch and pour .This will help you understand how the stuff acts and how much is needed to fill a given area.
[/SIZE][/SIZE]
 
freestylegeek

freestylegeek

waiting...
Location
Grand Rapids, MI
I'm a fan of 2.5 lb FiberFoam from Fiberlay.
My 4 lb US composites foam continued expanding AFTER the outer shell hardened (bowing my gunwales), then it shrunk after curing creating voids.

I'm in the process of redoing mine with FiberFoam, and so far it has expanded FAR better (no bowing, and maintaining form).
 
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