Exterior sculpture? Hi I'm just more or less to start painting the exterior of...
Hi
I'm just more or less to start painting the exterior of my house and am covering a gloomy colour with a lighter one. Is it better to put on 2 undercoats and 1 topcoat, or 1 undercoat and 2 topcoats, or 2 of respectively?
Does anyone know what the professionals would do?
Answers: On exterior: one undercoat and two gloss coats .
On interior: two undercoat and one comment on
Primer, undercoat and gloss serve different purposes.
Primer is for exposed surfaces, it is thin and soaks surrounded by to get a grip of the substrate, but it is no polite at resisting the elements. There are also specialist primers for problem, difficult or dense surfaces like stoneware, MDF, friable surfaces. You will only inevitability to spot prime where you hold taken the paint back to unclothed wood.
Undercoat is part of preparation. The outdated gloss is rock-hard, dense and shiny. If you put new make notes on (another hard dense coat) straight over the top it would (A) be prone to chipping rotten, and (b) would not adhere powerfully to the old make notes on. Undercoat is like putting a non-slip rubber mat between two frozen shiny surfaces of old and fresh gloss. It also act as a shock absorber to knocks.
Gloss - is as expected designed to resist the elements, but it doesn't grip bare wood okay or old make notes on. Hence you need the previous coats.
In decorate college we were skilled it was a virtual sin to apply two investigational gloss coats (with no undercoat between) as the second will not bind properly to the first. There is one exception to this however, and specifically if you apply your second coat of gloss on inwardly 24 hours or so of the first one. That is because although the first coat is has touch dried, it have not hardened fully and is therefore still pulling nouns and creating suction. The suction of the incompletely hardened first coat will pull on the second coat and they will bind as one. Do not put two coats of oil-base add footnotes to on the same light of day though as this is too soon.
Common sense say that as no-one is bang your exterior windows near a vacuum cleaner that one undercoat is sufficient and that two coats of gloss as protection against the elements will be beneficial and your second coat will probable hit any parts where your first coat be a bit thinner and going to blow first in years to come and thus extend the maintainance cycle.
On interiors it repeatedly makes sense to apply two undercoats for its shock absorber talent, but little sense to apply a second gloss against the elements.
You would not usually rely on comment on to obliterate a previous murky colour, and you may wish to put a second undercoat simply to wipe out the dark colour. After which you can still put one or two explain coats as you see fit.
It is worth buying Dulux 'trade' Weathershield undercoat and gloss which have more pigment. It is more expensive, but nothing compared to your chore costs and will extend the maintenance cycle. The best paint would be Sikkens Onol (undercoat) and Rubbol (gloss). For any you might need to step to a trade decorators merchant.
Please bear surrounded by mind that aside of your dark colour issue, it is fairly acceptable to put one undercoat and one add footnotes to. I have freshly told you where to put your extra energies if you want to.
If the paint on it very soon is not fading or blistering there is no call for to even apply a primer/undercoat...Clean the exterior with tsp(trisodium phosphate) or even a 4 to 1 marine bleach solution and clean it accurate..then use 2 coats of basically the finish paint... No need for a primer.