matt
New Member
Posts: 5 
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Post by matt on Jun 15, 2008 21:20:09 GMT
Hi, been a while...
I've fitted an Oak windowsill.
Sanded it, varnished 1st coat, raised grain...
Sanded smooth, varnished 2nd coat, raised grain...
Sanded smooth (again), varnished 3rd coat, raised grain.
What's going on?!
Is this something peculiar to Oak?!
I'm using quick drying Ronseal varnish.
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Post by dirtydeeds on Jun 15, 2008 22:19:24 GMT
on new timber varnish AWAYS needs two coats with VERY fine sanding in between first and second coat
P320 grit is good, they used to use wire wool
as to why you have a problem after the second coat i have no idea
ive never had this problem whatever the type of varnish, from water based to marine varinsh, they all work the same
EXCEPT on teak
teak has natural oils that slow the rate of adhesion / curing in which case you let the first coat down with 50% white spirit OR water (depending on the varnish type)
the fact is that on any new wood, the first coat of varnish should be let down
the adhsion of varnish on any wood is part mechanical part chemical
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Post by ocicat on Jun 19, 2008 7:52:16 GMT
Matt
I avoid this by using a cloth moistened with water and rub over the surface to raise the grain. it's a case of don't flood the surface but don't skimp on the water either. This is then quick and easy to rub down when dry and prevents continued raising with the finish. You'll still have to rub back after the first coat but perseverence gives a really good finish.
Alan
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matt
New Member
Posts: 5
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Post by matt on Jun 23, 2008 19:03:59 GMT
Thanks for the feedback. Good tip, Alan.
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