So, I made the mistake of using one part paint on hull and deck...

[Zozza 293]

...or so says a fella I know who used to paint Superyachts.

I have a GRP boat and had the opportunity to use two pot for hull and decks, but for some reason chose not to - I suppose through sheer ignorance.

Too late now - im not gonna sand off all my one pot topcoats and undercoats and start again

 

He reckons I should have used two pot paint, as the maintenance is so much less.

Apparently I am now in for a sand and recoat every couple years which sounds like a bit of a pain in the backside if true.

 

Still, this is what the Pardeys and Hiscocks and countless others had to do / still do, with their carvel planked boats.

 

Are one pot marine enamel paints as bad as my superyacht painter makes out?

 

I used the Altex brand of one pot paint.

[Zozza 293]

Sounds like Brent.Short on tact and exaggerates some.

 

Is a straight shooter.  And a good bloke with excellent skills. Thx for putting me onto him.

But , yeah, hoping for maybe four years before having to sand back and recoat!

[wheels 543]

If you gave it a minimum or 2 coats and preferably 3, then you should get 5 yrs. 7 if you are lucky and allow it to look a little shabby. Will wear fast in high wear areas and will not stand dings and scrapes.

2 pots will get you 15 to 20yrs. Once again, if it has had all the required coats. It also stands up to wear much better in high wear areas and can withstand minor dings and scrapes.
One advantage is that if you have applied several coats, you have a good film thickness that allows a cut and polish at 15yrs and it can look like new and last just as long again. The need to repaint is only if it has worn or been damaged.

Normally the Carvel hulls are painted in singles because the singles will move with the timber. The two pots won't and will just crack at the seems

 

[Zozza 293]

If you gave it a minimum or 2 coats and preferably 3, then you should get 5 yrs. 7 if you are lucky and allow it to look a little shabby. Will wear fast in high wear areas and will not stand dings and scrapes.

 

2 pots will get you 15 to 20yrs. Once again, if it has had all the required coats. It also stands up to wear much better in high wear areas and can withstand minor dings and scrapes.

One advantage is that if you have applied several coats, you have a good film thickness that allows a cut and polish at 15yrs and it can look like new and last just as long again. The need to repaint is only if it has worn or been damaged.

 

Normally the Carvel hulls are painted in singles because the singles will move with the timber. The two pots won't and will just crack at the seems

 

 

 

That's good Wheels - I can handle 5 years.  I guess, time will tell, and the bloke painting on the coats is definitely good at what he does.

Cheers

[gisywaterboy 3]

I have also started painting parts of my cockpit in toplac but am now regretting it, its alot of work to be repeating every 5 years. Is there some sort of barrier coat that can be applied between the toplac and a two pot undercoat? Kind of like a Primicon thing?

[wheels 543]

 

My experience has been LPU's flex just fine, its more of a regular maintenance thing using single pot as its a lot easier to touch up especially if a seam swells/shrinks

Not on Carvel. The expansion is huge and two pots simply crack. That is why some that have bought old fishing vessels end up getting the Hulls fully glassed over and then painted in two pot. Without the glass, the paint won't survive.

 

 

 

Is there some sort of barrier coat that can be applied between the toplac and a two pot undercoat? Kind of like a Primicon thing?

Sorry mate. Two reasons. The ability for a top coat to hold on is determined by what the substrate below is. If the paint below fails, then it makes no difference how good the top coat is. The second is that single pots are often turps or even water based. Two pots are usually a potent solvent based coating and the solvent eats the single underneath and it will react as if you crushed Paint stripper on it.

[Myjane 40]

What’s wrong with toplac I have had reasonable success with it , I use kero in to hold back the tack off time so no laps , it has a good shine but after 3 years my odd brush marks are there , I feel like a quick sand wet in dry and a top cote tidy up no undercote maby ,