Forum > General Discussion > Adhesion Promoter Or Plastic Primer ?

Drnytol Posted 01-May-2013 11:12
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14-Apr-2013

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I currently use a fine scotch pad to scuff up the item to be dipped, apply a plastic primer, base coat then dip but research shows that some people only use plastic primer under the base coat like me, some people just use a clear adhesion prompter and others use both !!

I'm just wondering what everyone uses ? 

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ChrisB Posted 02-May-2013 21:30
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31-Jan-2013

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hi, to keep things simple i use an etch primer for everything, you only need a fine dust coat and it will adhere to just about anything. only down side is that it doesnt have any filling properties. but if i need this i will go over the etch with a primer filler ,sand then basecoat, ive never had a problem and have used this on wood plastic and metal. if your dipping to polypropelene plastics then its a good idea to flame treat them aswell before you prime to get rid of the mold release.

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Drnytol Posted 10-May-2013 14:31
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Thanks for the response.
Do you always flame treat all polypropelene plastics ? I thought etch primer was an alternative to flame treating and to be honest i have visions of melting things with a blow torch. Also is the 70% rubbing alcohol suitable or is it worth paying extra for the 99% IPA ?

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ChrisB Posted 12-May-2013 16:27
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hi, yes i would just to make sure you get good adhesion but you could probly get away with scuffing and then etch priming. as long as you keep the flame moving then you wont melt the plastic and yes i only use the higher percentage alcohol spray, you can get it on ebay quite cheap.  

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