I have heard of Aquadur PU by Asian Paints and Camlin Picture Varnish Oil colors. Can I use them to seal my acrylic paintings?
Asian Aquadur PU is a wood varnish, which is something you already asked about here. These products are not made for varnishing paintings, so you can expect yellowing (and other detrimental characteristics).
Camlin Kokuyo Camel Picture Varnish is specifically aimed at varnishing paintings made with oils. Apparently, users experience a slight dilution of paint when used on acrylics, and others outright denounce it for this use.
I can't find any information on the nature of this product, so cannot comment on it from a more chemical perspective.
I can however suggest to simply get a varnish that is intended for use on acrylic paintings.
Camlin Picture Varnish Spray are meant for both oil and acrylic medium (see here). Hence you can use this to seal your painting.