Is this similar to GT85?

Yes, the Royal Purple 05000 Maxfilm High Performance Multipurpose Synthetic Penetrating Spray Lubricant is similar to GT85. Both products are synthetic lubricants that are designed to penetrate stuck parts and lubricate moving parts. They are also both water-resistant and can be used in a variety of applications.

Is this product better than pb blaster? i use pb blaster regularly for years on stuck bolts how does this compare?

This is the slickest stuff I've ever used. In fact, there are some things you don't want to use it on because it's too slick. As for breaking ceased bolts/parts, I've never tried it for that. Only used penetrating oils. Maxfilm is more like WD-40 on steroids, and well worth the money. If you use a lot of penetrating oil, even if Maxfilm would work, I would stick with PB Blaster because of price.

Can Royal Purple Maxfilm be used to rust proof the underside of a car?

Royal Purple Maxfilm would not be a suitable product for coating the underside of your vehicle. Consider a DIY truck bedliner for your vehicle winterizing.

Manufacturer	ROYAL PURPLE
Brand	Royal Purple
Product Dimensions	6.67 x 6.67 x 19.69 cm; 272.16 g
Item model number	ROY05000
OEM Part Number	05000
Item Dimensions L x W x H	6.7 x 6.7 x 19.7 cm
Item Weight	272 g

Royal Purple Max Film ROYAL PURPLE Maxfilm Multi-Purpose Lubricant, Penetrant, Preservative, 11 oz (312 g)

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