[SML] Lighting instrument Paint

[Dale Farmer]

Oil and grease are always present if you have people in the room.    Try 
including a wipedown with paint thinner or other solvent before priming 
and painting.  This also removes dust and cruft remaining from sanding.
Wrinkling and bubbling as soon as the second coat hits the first happens 
usually because the first coat hasn't cured enough or hasn't adhered to 
the underlying metal.  Sometimes you have chemical incompatibilities 
between the two paints that will cause this.   Read the directions on 
your paints carefully on drying and recoating times.  colder air temps 
will affect these times, and affect adhesion to the underlying metal.    
Generally all of the primers and paints from a single brand will be 
compatible, not so much if you cross brands.    Specialty paints like 
high heat paints require careful attention for this.

New paint on top of an old paint or powdercoating requires some 
preparation also.   clean off the surface, rough it up with some steel 
wool or something to give the paint something to grip upon, and pay 
attention to your dry and recoat times.

   --Dale

On 2/2/2015 10:24 AM, C. Andrew Dunning via Stagecraft wrote:
> Gents -
>
> In terms of prep, I'm using steel-wool.  Oil/grease really isn't an issue in
> this venue.  And, some of the frames I'm painting are new and simply
> "becoming" black.
>
> What I'm seeing seems to be a chemical reaction.  Within seconds of the new
> paint hitting the previous, I seen wrinkling and bubbling.
>
> - Andy
>
> -----Original Message-----
> From: Stagecraft [mailto:stagecraft-bounces at theatrical.net] On Behalf Of Dan
> Sheehan via Stagecraft
> Sent: Monday, February 02, 2015 9:04 AM
> To: Stagecraft Mailing List
> Subject: Re: [SML] Lighting instrument Paint
>
>>> Bruce Purdy wrote
>>          Are you doing any prep to the instruments before painting?
> same thing I thought
>
> paint-not-sticking is very rarely the fault of the paint
>
> I'd try a detergent (Pine Sol ? TSP-replacement?) and/or solvent (Liquid
> Sandpaper TM or similar) cleaning, then wire brush, steel wool, or
> sandpaper.
>
> Slightly possible, but unlikely,  the solvent in the new paint is eating the
> old paint,
>
> HTH
> --
> ...Dan Sheehan
> Fixer of things that break
>
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