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[Pointy]

Noooooo!!

I finished my 10 Hatch coaster last August and sailed at least 10 times since then. So why is the varnish on it going silly? Its the hull, I've got little spider webb effects- you know how the glaze on a really old vase looks cracked up sometimes- well thats what I've got happening on my Coaster :'(

Painted using Halfords car sprays and finished in Plasticote semi gloss.

Any advice/comments/suggestions or commiserations......

[DickyD]

I read on the forum just recently that there appears to be a problem using Halfords paints with Plasticote.

Richard

[Pointy]

If you use halfords sprays should you varnish at all and if so what should you use?

I'm well gutted about the coaster.

[chromedome]

HI Pointy...I used Halfords clear Lacquer on top of Halfords Paints.


chromedome

[boatmadman]

Anyone know whats best to use on top of humbrol enamels?

Ian

[DickyD]

Anyone know whats best to use on top of humbrol enamels?

Ian

How about Humbrol Varnish which they do in matt, satin or gloss.

Richard

[ron parker]

hello pointy 

I have a robbe u47 sub which I painted with halfords spray primer for the dark grey and humbrol for light grey and rust I then gave it three coats of ronseal diamond hard matt which didn,t attack either paint and has stood quite a long time in water, I found it does exactly what it sayes on the tin. and as a bonus it is water based so it is easy to clean up after. by the way I don,t sell the stuff. hope this might be some help. 
                                         ron

[anmo]

Noooooo!!

I finished my 10 Hatch coaster last August and sailed at least 10 times since then. So why is the varnish on it going silly? Its the hull, I've got little spider webb effects- you know how the glaze on a really old vase looks cracked up sometimes- well thats what I've got happening on my Coaster :'(

Painted using Halfords car sprays and finished in Plasticote semi gloss.

Any advice/comments/suggestions or commiserations......

Sounds like the basis for your problem could be slightly rushed surface preparation, the paint isn't adhering 100% to the fibreglass underneath to cope with expansion & contraction, and this movement is causing cracks in the varnish. How well did you prepare the hull before any primer/undercoat went on?

[bigH]

   Were the Humbrol paints enamel paints ???  if so then the Plasticote or acrylic coating placed over that will of its own accord stretch and retract and try to peel away leaving you with the effect you have.  bigH

[Pointy]

Hull preparation consisted of me using a very fine grade sandpaper and going over the whole hull for sometime. Primer was Halfords grey primer. Interestingly the hull under the waterline does not seem to be affected (yet?). The main hull colours of blue and white have been very hard hit. Varnish was sprayed on during a very hot day last year in July. It looked dusty on first application, later coats looked okay.

Do you think the Sun has anything to do with it?

No humbrul was used, just Halfords and Tamiya acrylic for some of the deck/details (not affected either)

Sanding down the damaged areas is just not practical- its the whole darn thing above waterline hull and parts of the supersturcture.

I'm stuffed aren't I?   :-\

PS
Please, someone put me out of my misery- it is effect or affect in this context?

[Tom Eccles]

Hi Pointy,

Firstly, if the varnish makes the finish look like an old vase then that is an effect.

If the varnish has caused this then that has had an affect, hope this helps.

Secondly, is it possible that the Halfords and the Plasticote are incompatible? e.g. are they both cellulose paints? For what its worth I sprayed my YORKSHIREMAN with Halfords clear lacquer and had the same problem in those areas I had painted using humbrol enamels such as the cappings and towbow although the effect is only apparent on areas painted matt black and of these, only those areas painted with paint from a different batch.

I sympathise, it must be soul destroying to see all your work not turning out as you wished. Maybe one of our number who is an experienced car sprayer/paint specialist can help

Tom

Keep on steaming

[Stavros]

Pointy this is a very strange one indeed as there should be no problem at all with using plasticoat over the halfords paint if it was the other way well.I am baffeled at what is wrong,it sounds very much I'm afraid as you said that you are stuffed.What I dont understand is WHY OH WHY do all you lads out there have to insist on varnishing your boats after all teh time preparing them for spraying what is the reason.If the reason is that you want a dull and not shiny finish simple lads hold the spray can furthere away and spray the hull slightly matt.Point I am afrid m8 it's start again Stavros

[DickyD]

Hi Pointy I had a similar problem with an old 1970s cabin cruiser I am doing up. It was originally painted with the Halfords car paint and I repainted it with Plasticote.
On one part of the hull the Plasticote went on a bit thick and reacted with the Halfords paint. It went like your vase effect.
I was lucky, when it had dried I gave it a light rub down and repainted using light coats of paint, not thick, and its been fine ever since.

Richard

[Pointy]

Thanks for the feedback guys. Stav' I varnished because I wanted to protect the becc lettering I had on it and everytime I read a review the reviewer always varnished. Suppose it protects paintwork against fading or scratches etc...? I wasn't keen on it either but did it anyway.

[tubby]

Pointy
If the lettering is self adhesive vinyl there is no need to varnish over to protect them,
after 24hrs the lettering will be stuck and last as long as any sign that you see above a shop.

Barry

[Pointy]

Pointy
If the lettering is self adhesive vinyl there is no need to varnish over to protect them,
after 24hrs the lettering will be stuck and last as long as any sign that you see above a shop.

Barry

Oh Bl**dy hell.

He's kidding right?!  Okay the above post does not exsit...nothing to see here move along.

I'm going to pretend that my becc lettering came from a faulty batch.

Thanks to my heroic but doomed varnishing Black Park was saved from lots of little white lettering floating about which could have been collected by some little so and so who could have then used it to spell rude words on the parks' benches to shock little old ladies. Yes, well done me!
Reckon I'm due for somekind of civic award or something?

[slewis]

too late now I know but This is called Crazing, the most probable cause is too many paint applications, i.e  the paint has been put on too thickly or built up too quickly ,normally found on bonnets and roofs of cars. Crazing can also be caused by incompatible paint products or incorrect re coating times.
I also think that maybe the problem is or could be the solvents in the lacquer are too aggresive and have attacked and softened the paint undeneath Ie incompatible products .
Unfortunatley there is no fix for this apart from stripping the lot back and repainting  :'( :'(

Sorry mate  :(

Shane (a car painter for the last 17 or so years )