Antifoul primer

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brians

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I am planning to have the hull blasted in March to remove 10+ years of old antifoul paint.

Will I need to apply a primer to the GRP prior to the 2 coats of antifoul? Planning to use Seaforce or Seaqueen this time.
 
brians said:
I am planning to have the hull blasted in March to remove 10+ years of old antifoul paint.

Will I need to apply a primer to the GRP prior to the 2 coats of antifoul? Planning to use Seaforce or Seaqueen this time.
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Absolutely YES - suggest you use Jotun Vinyguard Silvergrey 88 as it will definitely be compatible with either Seaforce or Seaqueen

PS - I speak from experience having once not done so and all my new antifoul just flaked off !!!!!!!!!!!!!!!!!!!!
 
brians said:
I am planning to have the hull blasted in March to remove 10+ years of old antifoul paint.

Will I need to apply a primer to the GRP prior to the 2 coats of antifoul? Planning to use Seaforce or Seaqueen this time.
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if you're going down to bare GRP then, unless it has already been treated, consider a couple of coats of two-pack epoxy first to protect against water ingress and hence osmosis and THEN the AF primer. Did that last year after MY ten years worth of paint had been grit-blasted off and when she was recovered in November she just needed a quick wash off to come up pristine.
 
Steve C Cronin said:
if you're going down to bare GRP then, unless it has already been treated, consider a couple of coats of two-pack epoxy first to protect against water ingress and hence osmosis and THEN the AF primer. Did that last year after MY ten years worth of paint had been grit-blasted off and when she was recovered in November she just needed a quick wash off to come up pristine.
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Only two coats? International specify 5 coats of Gelshield 200 for osmosis protection
 
Could always slap on some Coppercoat instead of Gelshield and anti-foul.....just a thought and works out cheaper apparently! (Coppercoat does the same as Gelshield or equivalents!)
 
Unless you are into racing you must be nuts to pay to have your hull blasted and then not to protect it properly after.

International Paints recommend 5 coats of Gelshield 200, then one coat Primocon primer, then antifoul when I did my own boat 3 years ago and I am very pleased with the results.

However the cost of International paints has gone stupid in my humble opinion even shopping around on line, we recently checked out the specifications for another boat but using the Jotun Penguard HB two pack epoxy and their Vinyguard 88 primer, and they are almost 'like for like' to the International paints, BUT half the cost AND you get twice as much!

We are both now using Seaqueen antifoul and again Twicethe amount for much less cost.http://www.smlmarinepaints.co.uk/primers/two-pack


Good luck
Mike
 
Steve C Cronin said:
There are better high build coatings than Gelshield these days.
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Epoxy mastic paint from http://rust.co.uk is excellent and suitable for below the waterline.

Excellent value and also available in a zinc rich version for steel hulls. Apply with a roller or spray for a smooth finish. Brushing leaves marks - its designed not to sag or self level so brush marks will not flow out - either vertically or horizontally. (its produced like this so it doesn't flow away from sharp edges, bump and corners and therefore maintains its thickness)
 
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