Paint finish problem

[Frank mellin]

Have a clinker built folkboat that has been completely refurbed last few months.
Carefully prepared and repainted hull in international toplac.
Undercoat went on well.
Several topcoats gave really nice finish.
After several weeks very large number of small blemishes started to appear all over boat.
Was told had applied paint too quickly!!
Have painted many boats previously and never had this problem.
Boat timbers completely dry when painted so problem is not moisture.
Think its time to use another product.
Appatently the owners of the boatyard where my boat is stored have also had similar probs.
Can anyone give a sensible reason for this problem.

 

[fisherman]

Seems to me that manufacturers are trying for a quick fix long life product, and some don't work as we might want. (Let alone the 'one coat' varieties)
I used Sandtex ten year gloss. On the FV wheelhouse it was great but on the antique rowing boat, not so. It's a hard plastic skin sort of finish which of course cracked at the first movement.
Then I tried Ronseal ten year weatherprpoof, racing green, I gave up trying to cover the undercoat, even after adding increasing amounts of gloss to it, it never covered. The undercoat specced is grey, no hope there.
Hempel was my answer, very good so far.
Not used International for many years, no idea about it now.

 

[veshengro]

" Apparently the owners of the boatyard where my boat is stored have also had similar probs."

Air quality? A local Industry nearby? If the Boatyard has experienced problems in the past, perhaps it's not the paint.
what started this train of thought is, my van was covered in 'Bits' the other day, a local Farmer about 3/4 mile away, but out of sight, was Combining.

 

[burgundyben]

They've changed Toplac and Prekite recently, I've both for a long long time and I wish they hadnt changed them.

 

[B27]

Sounds like solvent entrapment?

 

[Corribee Boy]

Care to explain a bit further?

 

[B27]

You'd have to look at the manufacturer's recommendations for the paint in question, but too many coats of glass paint in succession can trap solvents and other products which normally 'outgas' from the paint surface.

A friend fell foul of this when painting a motorbike many years ago, as I recall the paint co thought everyone should know about this and follow their instructions.
Some paint AIUI also only has a short time window when you're supposed to over coat it without rubbing down.

"Doing what it says on the tin" is a two way street.

 

[PCUK]

Did you use appropriate wood primers to seal the wood?