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Post by lynx on Sept 3, 2008 19:02:08 GMT
I've been using the Ronseal 2 pack filler from Homebase on a painted credenza i'm working on. I had to screw into the face of a panel, filled it, waited 30 minutes before sanding as instructions stated. All seemed flat until the first coat of primer. It's either the filler sinks very slightly or the MDF is expanding slightly. I'm using MR Medite and a new WB MDF primer/edge sealer.
So the question is, is it the filler that is sinking or the MDF expanding. I would have thought, if the latter it would return to normal after a day or two.
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Post by mrgrimsdale on Sept 3, 2008 19:22:44 GMT
I'd prime before filling, and give it a reasonable time to dry, before filling and after.
Ronseal 2 pack perhaps to hard for the mdf and creates a sanding problem? Something weaker and cheaper would do; pollyfilla, painter's mastic?
cheers
Jacob
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Post by lynx on Sept 5, 2008 10:32:07 GMT
I'll have a go at priming before hand. I just like to have it all sanded and filled first.
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Post by Dave S on Sept 5, 2008 12:21:18 GMT
Interesting - I once used a two-pack automotive filler for the same purpose and got the opposite effect - the filler seemed to expand.
Dave
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cadas
Full Member
Posts: 107
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Post by cadas on Sept 5, 2008 18:16:06 GMT
The instructions on the stuff I use do say 'initial shaping after 30mins' but in the small print it says 'machining after 24hrs'.
It is still flexible (rubbery) for quite a long time so if you power sand it can go hollow. I've just used some tonight on a piece, but I now tend to leave it until the evening to fill . 20-30 mins after filling trim with a stanley blade to near enough and then come back in the morning and sand.
For small filling I use an acetone based filler that dries in a few minutes and can be sanded in 15mins but it only fills 0.5mm-1.0mm at a time.
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