One of the few restrictions of
acrylic colours is that this type of paint does not adhere onto
greasy grounds, therefore not onto oil pastels either. Oil pastel
on acrylic colours in contrast is no problem. However, oil pastel,
of course, does not produce a film that is resistant to smudging.
If a painting produced in this mixed technique is not framed behind
glass it will therefore be vulnerable.
This can be remedied by varnishing the painting, or those parts
where the oil pastel was applied, with Varnish for Oil Pastels.
This water-based varnish has been specially developed for this, and
will not bead on the oil pastel. The varnish dries resistant to
water and protects the oil pastel against smudging. The adhesion
onto acrylic paint is also excellent.
Take care: Varnish for Oil Pastels in this case must not be
regarded as a final varnish. In the event of any later restoration
work this varnish cannot be removed without also damaging the oil
pastels and the acrylic colours. What's more, a final varnish based
on water may eventually form a white film. Once the pastel is
protected well by the varnish, a varnish based on solvent should be
applied as a final varnish.
All Rembrandt soft pastels are acid-free.