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About Tony Gallagher
Expertise
I can answer questions on all interior and exterior painted surfaces. Ranging from new plaster and woodwork to galvanised metal, rusty metal to exterior render stucco, All external timbers from solid oak to tannalised fencing. I have specialist knowledge on Flame Retardent products for Combustiable and Non Combustiable surfaces. Although some product knowledge of Car finishing I do not feel I have enough experience in that field to be able to offer knowledgable solutions.Colour queries are welcome but I have not got a design background and can only answer semi technical questions with regard to colour.

Experience
Fourty years selling decorative products on behalf of major manufacturers such as Permoglaze,Crown,Macphersons,Johnstones, Leyland,Sikkens & Sadolin. More recently in a merchant capacity I have been involved with Dulux, Farrow & Ball and Fired Earth products. I have recently commenced training in enviromentally friendly product ranges, such as vegatable oil paints and varnish.

Organizations
PDA (Assoiciate Member)

Education/Credentials
H N C Business Management. Several In House achievement certificates for product training.

Past/Present Clients
Ford Motor Company. Nissan, MOD, Home Office, The University of Sheffield, Local Goverment.

You are here: Experts > Style > Interior Decorating > Painting & Wallpapering > EXTERIOR LATEX PAINT

Painting & Wallpapering - EXTERIOR LATEX PAINT

Expert: Tony Gallagher - 11/2/2009

Question
Recently, I sprayed a Home Depot (Behr) satin latex over well-dried oil based primer on exterior siding. The siding is about 95 year old cedar in great condition that had been well scraped and sanded.
The time of year was late summer, early fall in Oregon. The weather had begun to change. The days were 75 F, but the nights were getting chilly -- near freezing. The house I was painting has a very deep overhang, so neither the sun nor any moisture was of any effect. After the first coat, on the north side of the house, there was a noticeable "separation" of the paint -- it looked as if the paint had not set up and it was running in some areas. These areas had a "soapy" feel. This was the only side of the house I noticed this taking place. I decided to use a clean rag with water and a degreaser to wipe off the residue. Later I applied a second coat, but the same thing happened again. Now, I am noticing the "soapy residue" on other areas of the house after the second coat was applied. Can you tell me what I may be dealing with?

Answer
David,

This is very difficult to advise upon without actually seeing the problem 'in the flesh'.
You seem to be describing contamination.
One clue is that you have applied water over oil, and should the original coatings have been loaded with preservatives or fungicidals this could be causing the reaction.
It would appear to me that you only have two remedies either re-coat with an oil based product or use a barrier primer.
My favourite primers are made by Zinsser (easily available on the Internet) They have several primer sealers that act like double sided tape adhering to the substrate and making a sound base for your preferred finish.
Sorry to be a bit vague, but I hope this helps.

Regards,

Tony.

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