in the past, calcium plumbate primers, a mordant solution or zinc phosphate primers have been used before decoration with oil paints. What is now normally specified and used - any advice would be most welcome.
Nige F said:Thought they were for New galv. you haven`t got new Crittals ,have you.....how do they comply with part x of the "save the planet" energy conservation document
confidentincompetent said:For touching in bare galvanised sections, I found Zinnsser bulseye 123 excellent...topcoats wont flake off...
http://zinsser.com/product_detail.asp?ProductID=11
Though I find some things dont work like it says on the tin
Colin_p said:When I did my crittals about 7 years ago, I stripped them back to metal and applied two coats of gloss straight on.
There were perfectly fine up untill a year ago when I had them ripped out and replaced with upvc.
There were only one or two areas that were problematical in terms of the paint coming off and this was where the opening casements met the frame and on the puttied areas. Other than that they still looked good so I'd say don't bother with mordant solutions or t washes.
confidentincompetent said:Colin_p said:When I did my crittals about 7 years ago, I stripped them back to metal and applied two coats of gloss straight on.
There were perfectly fine up untill a year ago when I had them ripped out and replaced with upvc.
There were only one or two areas that were problematical in terms of the paint coming off and this was where the opening casements met the frame and on the puttied areas. Other than that they still looked good so I'd say don't bother with mordant solutions or t washes.
You were soo lucky there colin.. I encounter quite a few jobs where galvanised objects such as crittals, garage doors etc have'nt been primed right. The worst being wrought gates/ railings where people have put 'Hammerite' ( ) strait onto galvanised. 2yrs later its all puckered up (salts) and flaking. Mordant solution is so easy but you have to coat over it before 24 hrs, Tried, tested and trusted by myself for more than 30 yrs. (oh dear should say 40 yrs now )
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