Pink Ironing Board Cover Should I Use A Primer On Weathered Exterior Timber Boarding - Before The Final Coat?

Should I use a primer on weathered exterior timber boarding - before the final coat? - pink ironing board cover

I'm an old weatherboard and iron house. It is seasoned and some boards are bare and painted, but now peeling badly.

I went into the paint shop thought it was was something that the first purchase went to commence the work - but none available. I could not finish the exterior color is to paint a self-priming. "

I have not used this type of paint before (and I do not know how long it on the market) and asked me if it is the right way - or do you think best with a first coat?

Anyone out there able to advise please?