Expanding foam - waterproof?

[DRFT - 86]

Ooops double post...

[DRFT - 86]

cheers everyone.......think it will be silicon or mustik until I do an engine swap and take the loom out.

on the topic of expanding foam though....Ive heard of people using it before for chasis stiffening............was pretty keen on the idea myself.

""Funkdoc""

It seems you used something other than the pressure packs to do this job.... what exactly did u use as I dont know much about this stuff.
you mention that it came in two parts ect..........can u list the cost of this shit and where to get it ect.

thanx.

[Medwin_3sGTE_AE86]

Here's a site i just found which give a lil info on the product i'm talking about...



i'm not sure what u meant by pressure packs but basicall u just mix the two parts together the the chemical reaction will start creating the foam and expand many times its original size... the one i used expands roughly 20 times its original volume.

So to use it... seal off the area completely.... leaving a hole on the top of the area to be foamed... the foam will expand through every lil gap it can find. Pour the already mixed chemicals into the hole and wait a few minutes and the foam will start to expand.... looks pretty cool... The hole up the top is also used to releive the pressure buildup... it is possible to bust the chassis if u do not let the excess pressure excape somehow...

[ae86levint]

u can get the expanding foam in pressure pasks at any hardware store, builders used to to use it to fill the gap un der and support baths until they realised it eventually compressed and fell away from them, so maybe thats not the best one to use

[DRFT - 86]

.........yep.....^^^.......thats what I meant by pressure packs.

thanx 4 that link 2.... I think I will prob do this mod eventually....

How much did it cost and where did u get it... (as site was u.s)

[funkymonkey]

the expanding foam you buy in hardware shops will collect water with years. When we do mechanic reports of AE86's and older drift cars in japan, we found that some guys had used this stuff in the chassis of their cars and it had collected water and started to rust from the inside... not a good look.

[DRFT - 86]

Hmmm, doesnt sound good at all........ thanx for the info.

[funkymonkey]

its usually due to condensation, but mostly because its a sponge like material. Proper marine grade polyeurathane foam on the other hand (which you can't buy in a can) dosen't suffer from this as much, however there is still condensation inbetween the spaces.

[Medwin_3sGTE_AE86]

Yeah....the stuff that comes in a can is no good.... gotta get the proper stuff.... the condensation is a problem so u gotta get a good rust protection b4 hand.... also it helps to seal off the whole area.... mine's bogged then painted over.... it should be pretty good.....but only time will tell.... lookin good so far....

[funkymonkey]

bog can soak up water after a while too hence why it's only used for superficial repairs in thin layers.