On 18/10/2020 21:18, alan_m wrote:
On 18/10/2020 10:09, Scott wrote:


I think it's galvanized.Â* There is no sign of any rust.

Zinsser Bulls Eye 123 primer.

I've used this successfully with a variety of undercoats/gloss both
water and solvent base.


https://www.zinsseruk.com/product/bulls-eye-1-2-3/
Available from Screwfix and Toolstation (often a 10%+ difference in price)

technical details
https://www.zinsseruk.com/core/wp-co...mer-Sealer.pdf


How to paint galvanised...

https://www.zinsseruk.com/howto/paint-galvanised-metal/

Obviously they are recommending their own paints after a 123 primer but
it seems to work well with any paint I've used on top of it.





I would spot prime the patches first with 123 then when dry in 1 hour
apply a coat of 123 over the whole door. This paint will stick well to
previous gloss, providing that the old paint is sound, and give a
somewhat mat keyed finish for the next coat of paint. At both points
check if the old paint was feathered enough at the edges and/or if the
finish so far is acceptable to you. The paint is not a filler and any
sharp raised edges between the sanded areas and existing paint is likely
to show in the final cot of paint.

If you have sanded through the galvanisation 123 is also claimed to be a
rust inhibiter.

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