Hi all
can you tell me is it ok to use undercoat on a radiator followed by gloss.
can you tell me is it ok to use undercoat on a radiator followed by gloss.
painting radiators
- Thread starter alarman
- Start date
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Yes, make sure rad' is turned off tho' to prevent paint/brush drying on you. 'Yellowing' will not occur for 10+ years with modern paints.
C
confidentincompetent
No dont use undercoat on rads/ hot surfaces, It will soften and crack. The reccomended system is to abrade lightly to key, wash, then one or two coats of gloss. The undercoat will also leave brushmarks,alarman said:
I use normal dulux trade gloss etc dont bother with 'special' expensive non yellowing type paints.
If you got rust on rad, touch prime then gloss only.
so would a satin wood be a better option if only one coat was going on
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confidentincompetent said:
Well .... I have never known u/c to "crack" in a "hot" situation. Also .... I would never apply "one" coat of gloss to anything.
C
confidentincompetent
alarman said:
Satinwood Is ok but usually find need two coats of satinwood.
Yes if you think the rad is not dirty/discoloured. It is rare that gloss or satinwood covers in one coat, even if you use 'Solo' or 'Once'.alarman said:
C
confidentincompetent
Magnolia Matt said:confidentincompetent said:alarman said:
Hi magnolia. Sorry to strongly dissagree, BUt this was way I was brought upNote when gloss on gloss abrade and clean instructions. The rads I painted today were painted by me with one coat of gloss 9 yrs ago and no flaking etc. When you come across a rad that is flaking and cracking you can bet its the undercoat thats the problem.
Actually check at brewers if you like, they will tell you same I'm sure. I asked when dulux aquatec was new if undercoat was needed on rads they said no and so did dulux trade site.
ok guys didn't mean to start an argument but thanks for the advice
but thanks for the advice 
p.s. dont paint the bleed valve.!!!
C
confidentincompetent
alarman said:ok guys didn't mean to start an argument
No argument lol. I used to undercoat many years ago ~~~~sigh ~~~But got a right *******ing when I started at a new firm (1970) and undercoated rads: was shown error of me ways.
Should add that heat enamels the gloss to the steel and make it very chip resistant, undercoat chips off hot surfaces easily.
Try asking dulux trade. its free.
good luck
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This painting radiators thing is weird...
I must admit im from the era of CC and I know what he means about the gloss business...it does makes sense too as gloss is more flexible than undercoat..and ive done it myself plenty of times...however...that 'rule' has been around for a very long time...back from when undercoats were a different formulation..ive often wondered if things have moved on..
And...ive never seen a rad crack because of it...
The worst thing you can put on a radiator is matt emulsion..it has barely any flexibility..and ive seen plenty of them flaking...but...ive also seen plenty of DIYer's get away with it and the paint holding fast
When the new water based gloss's came out they were not recommended for hot surfaces, but being the decorating rebel I am...I painted a rad with some...but used an oil based undercoat first..it is still going strong now 10 years down the line...
So..IMO...the jury is still out...but I do agree with CC...dont bother buying the poncy radiator paints...they stink and involve a lot of mucking around turning te rads on and off...
Give em two coats of oil based eggshell...it has good adhesion but is still flexible enough to cope with the expansion and contraction of the how surface.
I must admit im from the era of CC and I know what he means about the gloss business...it does makes sense too as gloss is more flexible than undercoat..and ive done it myself plenty of times...however...that 'rule' has been around for a very long time...back from when undercoats were a different formulation..ive often wondered if things have moved on..
And...ive never seen a rad crack because of it...
The worst thing you can put on a radiator is matt emulsion..it has barely any flexibility..and ive seen plenty of them flaking...but...ive also seen plenty of DIYer's get away with it and the paint holding fast
When the new water based gloss's came out they were not recommended for hot surfaces, but being the decorating rebel I am...I painted a rad with some...but used an oil based undercoat first..it is still going strong now 10 years down the line...
So..IMO...the jury is still out...but I do agree with CC...dont bother buying the poncy radiator paints...they stink and involve a lot of mucking around turning te rads on and off...
Give em two coats of oil based eggshell...it has good adhesion but is still flexible enough to cope with the expansion and contraction of the how surface.
C
confidentincompetent
spice said:Magnolia Matt said:
I agree, I always undercoat a rad thats never been painted, followed by either gloss or satinwood, perhaps I have been lucky but all the rads that I have painted have never once cracked.
Yeah but do your rads have a brush mark free, just been sprayed look, like mine do.
undercoating rads is a pointless exercise as proved from the many rads I have done with one coat of gloss (after prep) and being self employed I get to work on same rads many years later, like the four I did this week (9 years ago) which had only yellowed slightly like the rest of the paint trim. Carry on u/c but erm I dont see the point in doig soo DIYnot Local
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