Thin water based paint?

Hi;
This may be the wrong forum but I can't think of another...

I'm painting my roof with a water based paint. My problem is that the paint dries too fast, gums up on the roof, and clogs (gums) up the brush.

OK, so I phoned the manufacturer and the suggested using a different sprayer (even though I said I was using a brush) and if I really needed to thin the paint - go to 10% water thinning.

OK, so my question is this: Why only 10%? Why not 25%? It's hot up there and windy (even in the mornings) and I'm thinking that 10% won't be enough..

I'm asking firstly to make my job easier but also to educate myself.

Thanks
Norm (in FNQ)

PS: Found the right forum but can't figure out how to move this message. I'll re-post and then come back and delete this post..

PPS: no such luck in the delete department, sorry...

Thinning paint is one of those tricky things to get just right. It does not usually take a lot of thinner. It's very easy to over do the thinning. Thin enough to spray will likely be too thin to brush. The temp of the roof may mean that a spray is the best option. The application instructions should be followed as near as possible. Try a couple of thinning experiments with small amounts rather than over thin the whole drum/can.
Regards
John

Hi,
Try hosing the roof down to cool it off and paint while it it still damp.
Got this tip off the can of a water based paint in the misty past.
Regards

You could try adding Floods Floetrol The Flood Company Australia » Paint Additives » floetrol it helps slow down the drying time of water based paints.

Quote:

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Originally Posted by 62woollybugger

You could try adding Floods Floetrol The Flood Company Australia » Paint Additives » floetrol it helps slow down the drying time of water based paints.

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Interesting read, will look further into it... at a first read I din't see any mention of "Exterior" applications.