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Post Info TOPIC: Putty


Senior Member

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Date:
Putty


Does anyone know what the grey putty is named which manufacturers use to seal cables etc going thru van roofs?

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Senior Member

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It would be some form of Butyl Mastic.

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Kebbin



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Kebbin wrote:

It would be some form of Butyl Mastic.


 In an ideal world it would be Butyl Mastic, but these days the "tradies" take shortcuts and use silly-con.  Easy way to tell is to get a thin nail or strong needle and pierce the skin, by pushing it into the blob a few millimeters .  If it comes out wet or tacky chances are its Butyl Mastic if it comes out dry its most likely silicone.



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Steve, Di & Ziggy We named our Motorhome "Roadworx" because on the road works "Home for Summer"
Ford Transit with 302 Windsor V8 conversion, C4 Auto, 9 Inch Ford Diff All Lighting L.E.D., 260 Amp/h AGM, 530 Watt Solar + Kipor Backup Gen.



Senior Member

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Hi
As we all no
Butyl mastic generally black grey soft putty when new mild tack . Goes hard over time and looses colour . Losses its sealing ability
Silicon sets sold and rubbery /flexiable VERY VERY hard to remove items when this has been used .
Urethane sets hard and permanent


There are now RV silicon sealant . WAY WAY more flexible than std stuff and does not stick like superman --removable

SIKA Sil Industrial

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Member

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Other outstanding Sika products are Sikaflex 227 and Sikaflex 255 extra.

Both are polyurethane specialist Automotive sealant/adhesives and are available in black, white and grey. They are UV stabilised, meaning they wont break down or lose elasticity in direct sun.

Cheers.



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Veteran Member

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I use Sikaflex-291 that's what most good caravan and boat manufacturers use.
Can keep it in fridge for 12mths after opening.

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darjak


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+1 for the Sika products.

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Gregory O'Brien
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