Polyurethane can be oil or water based and you can use either kind over latex paint.
Acrylic clear coat over water based paint.
An oil paint may feel dry but actually continues to cure over several years.
A polyurethane finish can prolong the life of paint and prevent ultra violet rays from causing it to fade.
When you spray lacquer over a solvent based acrylic finish they combine to form a hybrid film even if the acrylic is pigmented to form a paint.
Oil based paints form a harder longer.
A universal clear coat paint for car bodywork that can be used on vehicles of all types.
As an example acrylic paints should not be used over oil based paints.
Paint an even thin coat that goes on milky but dries clear.
However oil based polyurethane tends to yellow as it ages whereas water based varieties stay transparent.
Pristine valspar 027 0018605 007 valspar pristine 100 acrylic paint primer semi gloss exterior house paint clear base 1 gal.
This solution is 2 parts golden gel medium to 1 part water.
If you are just applying decorative work then apply a clear.
The chemicals allow the paint to expand and contract with the weather and temperature making it a good choice for home exteriors.
The product is known as gamvar and the solvent is gamsol.
This is mainly because the drying times of water based products and oil based products are different.
It therefore forms a weak bond with acrylic paint if the paint is applied on top of the oil paint.
The acrylic based clear paint can be used to provide a coat on the top of existing paint to provide a gloss finish.
When to choose oil based paint.
I recommend painting an isolation layer on your piece first.
It isn t unusual to clear coat an acrylic paint finish on a metal surface such as on an automobile with cab acrylic or acrylic lacquer.
Acrylic paint like latex paint is made of acrylic resin.
It is supplied ready to use in an aerosol can.
Unfortunately when many do it yourselfers apply polyurethane over a water based latex or acrylic paint they end up with rampant flaking.
The difference is that while latex is water based acrylic is chemical based.
Let this gas out and the paint the gamvar on in a single thin even coat.
Yes if you are painting the entire piece acrylic paint can be used on oil stained wood after applying an oil based primer.