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Forsch Polymer Polyurethane question

M

Mac

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Joined
Nov 7, 2009
Messages
179
Location
Highlands Ranch, Colorado
this is my question,

i have 2 rear RR that i'm going to fill, 1 of them is on the car, and the other is a spare... now obviously i'm going to start with the spare one i have, but i'm thinking that if i mix the whole contents of parts A&B, that i won't be able to store the remaining polyurethane for the 2 days it will take for the spare RR to cure and then take of the 1 on my car and fill that one...

i'm thinking that i'm just going to have to take the one off my car and fill them both at the same time, but was hoping that there is some small amount of shelf life on the Polyurethane after you mix in the Activator...

has anybody done this? or has everyone just filled at one time?

-Mac
 
ok, so after reading my initial post, i realized it was kind of confusing...

so basically this is my question -

After you mix in the activator with the poly, can you store any remaining poly for a short amount of time, like say 3 days or less?

thanks in advance!

-Mac
 
Do the destructions for the poly mention anything about pot life or working time? Pot life/working time is how long mixed material is pourable and usable.

Can you mix half the resin and activator, instead of the whole batch?

Is it one of their liquid urethane products?
http://www.forschpolymer.com/images/instruction.pdf
Looks like you have between 15 and 25 minutes.
 
yes thats the exact same thing that came with the kit... and i see that it says working time @70 degree's is 15-20 mins...

i was thinking about just mixing half and half, but i'm worried i will not be able to get an accurate mixture as well as making a huge mess, not to mention how much i might need...

do you think there might be a way to freeze it or something? like put it in the fridge? cuz it says @70 15-20 mins, and somwhere else in there it says that heat helps it cure i think, so i'm thought maybe putting it in the fridge would buy me enough time to have the 1 cure, and then do the other one so that i don't have to drive around without a RR...

but if this is not possible, how bad is it to drive without a rear RR? i mean in all honesty, my rear on the car now is so shot it's almost like there isn't one there, but having it completely off may be another story...

so how bad is it to drive without one on there?

thanks, Mac
 
gmorrell said:
Do the destructions...
Click to expand...

Hahaha someone else refers to those documents as destructions too :)

Yea I would just mix half of the contents to do one mount. Once that stuff is mixed you only have the typically working time to use it otherwise your done and the left overs are worthless...
 
yah, well i think trying to only mix half will end up being harder than it's worth, not to mention messy and not accurate...

i think i'm gona just pick up another rear RR core from the JY and go that route..

my plan was to fill my spare and the one on my car, and then sell one and make back the money i spent on the polyurethane, so i basically made a free poly mount, but i guess that won't work quite how i planned it...

thanks for the advice!

-Mac
 
The poly takes a very specific amount of the hardening agent to achieve the proper hardness. IIRC, 60A actually takes more than 80A. Therefore, I wouldn't be trying to measure it myself and half it.

You'll need to do all of the mounts at once, and I wouldn't suggest doing more than 2-3 at a time, because if you spring a leak, you'll be in for a lot of fun, and probably run out of poly. One can will do two rears with the OE rubber still intact, or the way I do it with the rubber completely removed, you'll need two 1 lb cans which can yield you 3 mounts, IIRC.

Make sure that you have a solid plan for sealing the bottom side of the mount, keeping the bushing perfectly centered, and keeping the mount perfectly level. Also, keep in mind that you'll need to account for the bushing being wider than the body of the mount.

100_2373.jpg


100_5828.jpg
 
Mac said:
my plan was to fill my spare and the one on my car, and then sell one and make back the money i spent on the polyurethane, so i basically made a free poly mount, but i guess that won't work quite how i planned it...
Click to expand...

Not going to happen. You're going to have about $90 into poly, misc. materials, core and shipping one. So, even if you associate all costs of production with the one you sell, your mount that you keep is going to cost you about $60. So, you'd have to sell one for $150 to cover the costs. NPG sells them all day for ~$115 shipped.
 
oh well, i already ordered and recieved a 1lb kit of the 60A... so your telling me that the 1lb kit i have won't fill 2 mounts? so i mind as well just do the one i have and call it a day
 
If you leave the rubber in the mounts you can probably fill 2 mounts. But make sure you get the center hole centered because that rubber probably failed and it will be off center due to the saggy rubber.
 
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