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Old 8th Aug 2020, 3:15 pm   #1
Mike Phelan
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Question What sort of plastic?

Mods, please delete if this is too far O/T, but the contents could well be radio or television related.

I have some white fascia board, several years ago, which I need to prime and undercoat; because of this I need to know what sort of plastic it is.

I have scraped a sliver off and burnt it in a flame to see what happened. It went black and burnt with just a few small sparks; no flame and no apparent smell, then going out.

Any ideas folks? TIA.
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Old 8th Aug 2020, 3:19 pm   #2
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Default Re: What sort of plastic?

I would sand it down using 400 grit wet and dry and then almost any primer will stick.
 
Old 8th Aug 2020, 3:24 pm   #3
Mike Phelan
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Default Re: What sort of plastic?

Wow - thanks for that - instant reply! I'll see what everyone else says before I head for Amazon.
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Old 8th Aug 2020, 3:30 pm   #4
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Default Re: What sort of plastic?

If you mean fascia board as in roofing, then it's almost certainly a UPVC grade, and could be primed & painted.

It's maybe worth noting however, that if it's indeed a roof fascia board that's 'yellowed', the yellowing would not be just a colour change, but indicative of UV degradation of the plastic over the years. It used to be quite common with the cheaper UPVC grades after a few years, especially those with higher recycle content.

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Old 8th Aug 2020, 4:09 pm   #5
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Default Re: What sort of plastic?

Hi Alan,

It is indeed a roof fascia, but not yellowed at all, though being probably twenty years old facing the sun.

My question was really what sort of primer and undercoat to use.

Thanks,
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Old 8th Aug 2020, 5:18 pm   #6
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Default Re: What sort of plastic?

UPVC, there are "proper" plastic primers that contain a solvent which (slightly) dissolves the substrate. They stick like s**t to a blanket.
 
Old 8th Aug 2020, 6:09 pm   #7
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Default Re: What sort of plastic?

A rub down with wet and dry followed by a degreasing is usually needed as the production process sometimes involves lubricants and polish may well be present if it’s a used piece. Standard alkyd primers and paint will stick well, as do the special primers etc of course.
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Old 8th Aug 2020, 6:22 pm   #8
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Default Re: What sort of plastic?

I would try a etching primer as used in the motor trade
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Old 8th Aug 2020, 6:48 pm   #9
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Default Re: What sort of plastic?

Hi folks,

Thanks to all, I've ordered some brush UPVC primer which will arrive tomorrow, so we're all sorted.
A quick IPA degrease first.

Mods, you may close this thread; thanks.
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