Thinning Undercoat

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Hi,

Painting a boat for the first time and used a good quality brush, that left brush marks on the GRP. After rubbing down with 400 wet and dry it nearly removed all the undercoat to get the brush marks out. Any ideas on how to prevent this, such as thinning the paint?

Thanks,
Norman

p.s its International Pre-Kote paint that we're using
 
Thanks guys, going to give that a go this weekend. Didn't expect such a quick reply. Looks like a good forum.

Norman
 
Aaaargh. Laying off with a brush has never worked for me.
Use good quality mini rollers (the foam one, not the wool ones). I say good quality because the 10 pack for a fiver sort have the unfortunate property of de-bonding from the centre core when the paint solvent attacks the glue. The foam sleeve then rolls off the handle and messes up your nice paint.
Charge the roller and put some horizontal strips of paint on. Then roller downwards and finally, when the roller is nearly exhausted, lay-off with very light downwards strokes of the roller, hardly touching the paint film. Then recharge the roller and do the next section. Cut in under the rubbing strake with a brush before you start rollering. Don't thin the primer or top coat more than 5% if you are rollering a single pack paint. can't tell you about 2 packs as I've never used them.


paintrollering.jpg


Should look like this when you've done. (except you'll still have a mast)

paintshiny.jpg


paintshiny2.jpg


I used it for a season and sold it. The first guy who came bought it.

http://www.lakelandimages.co.uk/taylor/
 
If you need to thin normal one pot paint then Owatrol is excellent, it is a paint oil rather than thinners and makes the paint flow out easier, I have used it for some years on a wooden boat, but it should be just as good on GRP.
 
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Owatrol

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I think it's a brand not a product since amongst other things they now produce Deks Olje. Could you be more specific?
 
When I last bought it, the product name was Owatrol. Maybe "Original" or something but I only remember Owatrol. It did not come in a "paint" can, but in one of those rectangular cans that thinners used to be sold in. And maple syrup (in Canada.) I do remember that, after using some and despite screwing on the can top firmly, it jelled in the can.

That is a great paint job Phil. What type of paint did you use? I think Wight Dawn is really needeing her first paint job on the topsides. Next year though.
 
It was Blakes Brilliant Enamel. Not that brilliant in that it's a rather soft paint and not as tough as the previous Yacht Enamel. Does look nice though, and easy to touch-up, unlike 2 packs.
 
Owatrol also comes in 250ml round tins.
I also turned to Owarol when rolling n' tipping with Blakes enamel on the (wood) hull of my boat. The problem was by the time I was tipping the paint was starting to drag badly. The Owatrol just increased the flow enough.
Its good for rust prevention used neat and as a laquer on polished brass & bronze.
 
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