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Posted by RichK on August 16, 2007, 3:10 pm
Hi,
Have a case of peeling paint on the door frame. Looks fine, but if you
scrape it, even with a finger nail, it comes off quite easily. Was painted
before my time. There's a layer of paint, under the one that's peeling.
Suspect it's a case of latex on oil, without a primer. Removing the top
layer would be a mess. If I primed the top layer with say Kilz (or
similar), would the primer penetrate the latex and attach itself to the
layer below?
Do not know the age of the top layer, but could be 5 years.
TIA,
RichK
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Posted by Don Phillipson on August 16, 2007, 3:35 pm
> Have a case of peeling paint on the door frame. Looks fine, but if you
> scrape it, even with a finger nail, it comes off quite easily. Was
painted
> before my time. There's a layer of paint, under the one that's peeling.
>
> Suspect it's a case of latex on oil, without a primer. Removing the top
> layer would be a mess. If I primed the top layer with say Kilz (or
> similar), would the primer penetrate the latex and attach itself to the
> layer below?
1. No, new primer is not likely to penetrate the
old colour coat and adhere to the old primer which
you do not know for sure to be there.
2. Your questiion is framed as if you were sure the
old colour coat flakes off leaving the old primer safely
adhering. This seems unlikely, unless both (2a) the
old primer was correctly applied and (2b) the old colour
coat was improperly applied (e.g. surface not washed
and sanded beforehand.)
You must decide between:
Method A = thorough preparation (scraping or blowtorch
to remove loose paint, then filling and sanding to prepare
a good surface; then quality paint, both primer and colour
coat.
Method B = touching up, perhaps in spots, while knowing
that if you guessed wrong in any one respect you will
have to go to Method A later.
--
Don Phillipson
Carlsbad Springs
(Ottawa, Canada)
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Posted by RichK on August 17, 2007, 9:28 am
> 1. No, new primer is not likely to penetrate the
> old colour coat and adhere to the old primer which
> you do not know for sure to be there.
I'm guessing that the sequence was: bare wood, primer, oil-paint, latex (the
layer that is peeling). Whatever is under the latex is very healthy.
Suspect was painted just to refresh.
> 2. Your questiion is framed as if you were sure the
> old colour coat flakes off leaving the old primer safely
> adhering. This seems unlikely, unless both (2a) the
> old primer was correctly applied and (2b) the old colour
> coat was improperly applied (e.g. surface not washed
> and sanded beforehand.)
I was wondering if a primer such a KILZ would penetrated the latex layer and
adhere to whatever is under, which is oil-based paint most likely. Since it
appears, I have several interior door in this situation, I want to pick a
method, which would be least painful and at least effective.
> You must decide between:
> Method A = thorough preparation (scraping or blowtorch
> to remove loose paint, then filling and sanding to prepare
> a good surface; then quality paint, both primer and colour
Would you use a regular small propane torch to heat the paint? Most places
sell a hairdryer type heat gun, but it seems that it waste most of the heat
and not scorch the paint.
Regards,
RichK
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Posted by RickH on August 16, 2007, 4:04 pm
> Hi,
>
> Have a case of peeling paint on the door frame. Looks fine, but if you
> scrape it, even with a finger nail, it comes off quite easily. Was painted
> before my time. There's a layer of paint, under the one that's peeling.
>
> Suspect it's a case of latex on oil, without a primer. Removing the top
> layer would be a mess. If I primed the top layer with say Kilz (or
> similar), would the primer penetrate the latex and attach itself to the
> layer below?
>
> Do not know the age of the top layer, but could be 5 years.
>
> TIA,
>
> RichK
If you can get it off with a fingernail then stripping it should be
easy, the new strippers are pretty gentle on your lungs and hands
compared to years ago. Then you could just prime/paint onto the good
layer. No, primer wont penetrate it and somehow re-attach the layer
below.
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Posted by RichK on August 16, 2007, 4:12 pm
Guess you're suggesting a chemical stripper. Which should I use, since it
would be working on both layers, which are of different paint?
The top layer would be easy to remove mechanically, but messy. Well, no
paint is easy to remove :-) Bottom (I suspect oil) is very well attached to
the wood.
RichK
> If you can get it off with a fingernail then stripping it should be
> easy, the new strippers are pretty gentle on your lungs and hands
> compared to years ago. Then you could just prime/paint onto the good
> layer. No, primer wont penetrate it and somehow re-attach the layer
> below.
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