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In the Forum: Horn-Loaded Speakers
In the Thread: Macondo’s Midbass Project – the grown up time.
Post Subject: Babysitting the foamPosted by Romy the Cat on: 8/31/2010
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 jessie.dazzle wrote:
I didn't know rigid (hard) foam was available in a spray can.

Be careful; if you're using proper rigid foam, it expands with great force and would likely push through any tape protecting the cone of the driver.

However, the only really rigid foam I know of is a 2-part product that must be mixed in proper proportions. If high density is desired, the reaction must take place in a confining (volume-limiting) and very strong container.

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

Yes, I know it and I played a lot with heard foams. I think is the key is to know your foam and to know this particular brand expends. What I usually do is cover the driver with hard paper, spray the foam and while the foam is expending I babysit the driver, looking if the foam goes to driver too much and remove the foam with stick. It is messy like hell but it last 5-10 minutes no more. Then when the foam solidifies I cut it accurately with a sharp knife.  
 

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