Best tie/barrier/undercoat for varied surface?

Fascadale

Fascadale

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I'm looking for a product to "undercoat" the undersides of my saily boat

Some of the hull is bare gelcoat, but large areas of it still have antifouling

The whole hull was stripped back to the gelcoat a few years ago and I have no wish to to that again

Is there a product that will go onto bare fibreglass and (well sanded) antifouling?

Tie coat? Barrier coat? Undercoat?

Thanks
 
Anything you put over antifoul (other than compatible antifoul) will come straight off.
What are you planning to put over the undercoat? That will affect what to use.
 
Primocon is designed specifically for this, among other things. Jotun also do a cheaper equivalent but I can't remember the name. From the Primocon datasheet.

PRODUCT DESCRIPTION
A fast drying single pack aluminium pigmented vinyl anticorrosive primer. For application to Timber, GRP, Steel, Aluminium, Cast Iron Keels and Lead Keels, below
the waterline prior to application of antifouling paint. Can be used under specified International antifoulings or as a barrier/sealer coat over incompatible or
unknown antifoulings.
* Recoatable with itself for long periods
* Quick drying even in poor drying conditions
* Can be applied by brush, roller or spray
 
Last edited:
Ammonite said:
Jotun also do a cheaper equivalent but I can remember the name
Click to expand...
Jotun vinyguard . £43 for 5 litres or £24 for 750ml of international primocon.
They both appear to be the same product other than jotun say it can also be used above the waterline.
You would need ṭo sand the bare gelcoat for any coating to have a chance at bonding
 
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